Single ladies, you might be sabotaging your romantic chances if you hang out with a posse of guy friends, according to a Texas Christian University study. The researchers surveyed men, and found that women were rated equally attractive whether they were alone or with other women. But the attractiveness dropped dramatically when a woman was surrounded by a group of men.

That's because there's a good chance she's already spoken for, believes Sarah Hill, professor of psychology and coauthor of the study, which deters most suitors.

Bottom line: Plan a girls night out; you might find Mr. Right.

Ever wonder why your guy rolls over and starts snoring right after making love? Billy Goldberg, M.D., co-author of Why Do Men Fall Asleep After Sex?, may found have the answer.

"After orgasm, both men and women release the chemicals oxytocin, prolactin, gamma amino butyric acid (GABA), and endorphins. Each of these contributes to that roll-over-and-snore feeling," says Goldberg.

But since both sexes release the same post-climax hormones, but why is the after-nooky snooze more of a guy trait? It's likely because women don't always have orgasms during sex, and hence, don't always release the sleep-inducing hormones. "If that's true, then you have your answer as to why men fall asleep after sex," he adds.

Squeeze your way to better sex! The optimum way to achieve better orgasms is to strengthen and tighten your pelvic floor -- the actual muscles that do the most work during sex. "This is the group of six muscles that control and hold in place all of the holes in that area: The urethra, vagina and anus," explains Marcelle Perks, author of Incredible Orgasms, and strengthening these muscles -- also called PC muscles -- increases arousal rate, sensations and stamina.

About a third of all women have weak pelvic floors, according to Perks, so that means a lot of us have room for improvement. Try these discreet sexercises you can do anywhere -- whether you're at your desk, in your car or waiting in line. Build up to completing these three times a day: The more you practice, the faster you'll see (and feel) results.

Kegel hold. While seated, squeeze your pelvic-floor muscles and hold for 5 to 10 seconds, then release. "The best way to find your PCs is to put a finger in your vagina and clench your muscles. You should be able to feel pressure on your finger," Perks says. But you can also easily locate these muscles by pretending you're holding back urine. Do 5 to 10 times.

Kegel pulse. While sitting, squeeze and release the pelvic-floor muscles quickly for 5 to 10 times.

Inner-thigh squeeze. Sit on a chair (at a desk to be discreet). Squeeze your knees together as you contract and release your pelvic-floor muscles. Do 3 to 5 reps.

Standing Kegels. Do the Kegel hold and Kegel pulse moves again, this time standing upright. Do 5 to 10 reps for each.

If you have sexual fantasies, you're among the 85 percent of adult women who do, according to Brett Kahr, a British psychotherapist and author of Who's Been Sleeping In Your Head: The Secret World of Sexual Fantasies.

Kahr, who conducted a large-scale study of the sexual fantasies of 23,000 adults, reveals the many people fantasize as a way to fulfill often unconscious psychological needs, and a means of exploring sexual activities inaccessible in real life. "They play and important role in boosting libido, improving relationships, and can have a therapeutic effect on our moods and confidence," says Kahr. Some surprising findings from his survey:

If you want to know more about the guy you're dating, his family tree is a good place to start -- or more specifically, his birth order or the order he was born into a family. "While other factors, such as age, race, and gender, all play a role in shaping personality, research indicates that the number one factor influencing personality is birth order," explains William Cane, author of The Birth Order Book of Love, who has analyzed the birth order of 6,000 celebrities, historical figures and couples.

Birth order personality
Firstborn
Because firstborns are usually given more responsibility from young to look after their siblings, they typically grow up to be dominant, super-responsible, organized and competitive.

Middle child
The middle child is a people-pleaser. He or she is diplomatic, and it's difficult to get them to take a stand. The middleborn also tends to be a little manipulative.

Lastborn
Lastborns are friendly, creative individuals who love challenging the status quo. They're more adventurous than their siblings and are the risk-taker in the family, although they also tend to be needy at times.

Only child
An only child is used to being in the spotlight within the family, so he or she tends to crave attention. Being an only child also means that he or she is unlikely to know very much about the opposite sex.

Twins
Twins have a strong bond and therefore always think of the other before making a decision. Their thoughtful nature makes them considerate romantic partners.

The next time you and your guy head down to the ice-cream parlor, eyeball his order to get the inside scoop on his personality. In his book What Flavor is Your Personality? Dr. Alan Hirsch, neurological director of the Smell and Taste Research and Treatment Foundation in Chicago, uses the results of a personality survey to match people's traits with their favorite foods, including ice cream. "It was amazing to discover how distinct personalities corresponded with ice cream flavors," says Hirsch.

Based on the science of "flavorology", here's what your guy's favorite flavor says about his personality:

Vanilla
Contrary to what you may expect, vanilla lovers aren't bland or boring. Rather, your guy is quite the risk-taker who sets high goals for himself and tends to live a hectic life with an overly filled schedule. He's fun-loving, expressive and prefers a close, secure relationship.

Most compatible with: Other vanilla lovers

Double chocolate chunk
Your partner is creative, charming and enjoys being the life of the party. When it comes to your love life, he often expects a lot of attention from you, but he also puts in just as much effort into the relationship.

Most compatible with: Butter-pecan or chocolate chip lovers

Strawberry
Your man is loyal, trustworthy, and tends to be a little reserved. He's not one to fall head-over-heels in love with someone in a flash, but when he does go into a relationship, he stays committed.

Most compatible with: Chocolate chip lovers

Chocolate chip
He is a confident and ambitious guy who is charming in social situations. Because of his go-getter nature, he can be intolerant of defeat.

Most compatible with: Butter-pecan or double chocolate chunk lover

Butter pecan
He is a perfectionist who is conscientious and detail-oriented, which makes him a very attentive lover or spouse. He also tends to be sexually reserved.

Most compatible with: Other butter-pecan lovers

Meet the new hot spot on your pleasure map: It's called the anterior fornix erogenous (AFE) zone or A-spot. "It is the smooth area midway between a woman's cervix and G-spot, on the front wall of the vagina, that appears as a spongy, wrinkled, scrotal-like swelling and is extremely sensitive to stimulating touch," explains Yvonne K. Fulbright, Ph.D., a sexologist and author of Touch Me There!

Stimulating this nerve-packed hot spot delivers pleasurable sensations and produces lubrication, which add up to explosive orgasms. It's also beneficial for couples who experience vaginal dryness during sex. You can locate your A-spot yourself, but it's much more fun exploring with your partner! Here's how to find it:

Lying on your back with your knees up, insert a finger into your vagina and slide along the front wall until you feel your cervix (which feels like the tip of your nose). Move your finger to feel the spongy area between your cervix and the front vaginal wall, using a firm, repeated in-out motion to stroke the entire length. When you feel a wave of pleasurable sensation, you know you've hit the spot!

If you suspect your partner hasn't been faithful, there are usually warning signals to look out for. And according to marriage counselor and author of The Truth About Cheating M. Gary Neuman, who surveyed 200 cheating and non-cheating husbands, men who are involved in extra-marital affairs do share some similar traits:

He spends more time away from home. 55 percent said more time spent away from home was a sign that they were close to infidelity, and this rose slightly to 61 percent when they were involved in infidelity.

You have lesser sex. 34 percent of men reported diminished sexual activity as a sign that they were close to infidelity, and it increased to 43 percent once the affair began.

He avoids your phone calls. 29 percent of men admitted to avoiding their partners' cell phone calls when they were on the verge of infidelity, and this dipped slightly to 24 percent when they became involved in an extra-marital affair.

He criticizes you more. 25 percent said they started criticizing their wives, and this decreased to 19 percent once the infidelity began.

He starts more fights with you. 20 percent said they had more quarrels with their wives.

What's interesting, Neuman points out, is that the majority of the men started displaying these warning signs before they cheated. So they indicate not only that a husband is cheating but are also a precursor to his cheating.

"Remember, it's not proof that he's cheating, but it's pretty clear that he's close, and there should be no waiting on talking about changes to make your marriage better quickly," he adds. "If you can catch the signs in time you might avoid the pain of infidelity and be able to repair your relationship," Neuman concludes.

Missionary sex may have a rep for being old-fashioned or boring, but it remains a staple position couples fall back on, simply because it feels so good for both partners. Plus, if you're self-conscious about your body, the missionary position will make you feel more confident -- you're reclined with your partner's body covering yours, so all his focus will be on your sensuous eyes and sexy parted lips, versus those jiggly bits that'll be in full view when you're on top.

By changing your position slightly, you can alter the kind of stimulation you receive. Some va-va-vroom variants to try:

Your legs bent with knees up

This allows a deeper penetration, which means more pressure in the back part of your vagina. 

Keep your legs together

You'll hug his penis more tightly, giving you a better clitoral stimulation. 

Your legs over his shoulders

This gives a very deep penetration, giving more friction and stimulation to the G-spot.

Pillow under your hips

This raises your pelvis, increasing clitoral stimulation.

What's your love destiny? That all depends on the size of your pout, according to a study from the University of Leicester in England.

Couples whose lips are of a similar size and shape are more likely to stay together. The researchers found that 88 percent of happy couples had lips that mirrored each other's.

The study also showed that while men are instantly attracted to women with a luscious pout, they don't consider them marriage material. In fact, women with thinner lips are 57 percent more likely to have longer relationships than their pouty-lipped counterparts. Ditto for men: Thin-lipped guys are 39 percent more likely to have a longer-lasting relationship compared to men with full lips.

The size of your kissers can also reveal loads about your personality, say the researchers:

If you have...

A large mouth:

You're laid back, relaxed, easy, generous, and enjoys being in the middle of life.

A small mouth:

You're independent, strong-willed, precise, have great endurance and fighting spirit.

Full lips:

You're emotional, passionate, sensual, expresive, talkative and outgoing.

Thin lips:

You're efficient, achieving, disciplined, make clear and precise statements, and get on with life without fuss.