Things You Should Know About Sex

From Prevention, here's the first part of the list of things you should know about sex by age 40:


1. He doesn't care if you've shaved.


2. Wide beats long every time. If you care at all about penis size (and studies show that women are far more into how penises look than how they're hung), you know that width matters more than length.


3. All the girls are doing it. Masturbating, that is. In a 2004 survey by AARP, nearly half the women between the ages of 45 and 49 said they had taken matters into their own hands in the previous 6 months. And many women have used more than just their hands. In a 2009 survey by the University of Indiana, more than half the respondents had used a vibrator at least once, and nearly one in five had used one in the previous month.


4. He likes the cuddling part, too...and not just because he's half comatose when you snuggle up after sex. During lovemaking, both men and women release the chemical oxytocin -- the so-called "cuddle hormone" that helps new moms bond with their babies. So what does than mean for men? Oxytocin boosts their desire for intimacy, along with their feelings of trust, according to a 2008 study by the University of Zurich. And in this case, what's good for the gander is good for the goose.


5. You really can tell a guy's size by his hands. The longer a man's ring finger, the longer his penis, a study by University of Liverpool shows. Both are determined by the amount of testosterone he was exposed to in the womb. If his ring finger is the same size or smaller than his index finger, he received lower levels of testosterone. If it's bigger…watch out!