If you thought men's sexual response is quite simple and their needs can be met easily, then you certainly need to revise your knowledge of the "birds and bees," for men aren't as simple as they are made out to be.

According to Fox News, here are 10 things that you didn't know about men and sex:

1. Trapped Sperm

Not all sperm go racing for the egg at once.

Math has solved many a complex equations over the years, and now it can also find you the perfect answer to who might be the best lover for you.

Anthropologist Barnaby Dixson studied what the sexes found attractive in a partner across cultures.

Dixson said the same formula for what men favoured in women came up almost every single time- a waist-to- hip ratio of 0.7.

Which means, a waist measurement exactly 70 per cent of the hip circumference is the perfect number.

Dixson said that men didn't take other factors into account when they saw a woman with that waist-to-hip ratio.

London: Marriage seems to be bad for your sex life. Couples who have sex over four times a week before their wedding, barely have it once a week three years after tying the knot, a survey in Britain has found. Researchers found that before marriage, couples can hope to have sex more than four times a week. But after three years of married life, there is a dramatic drop in their sex life and most couples have sex just once every seven days.

The survey was conducted among 3,000 married couple.

Ovulation changes a woman’s behaviour in a startling number of ways from the way she walks, talks and dresses to the men she flirts with, according to a new study.

According to experts, the new findings might offer some practical tips for women to boost their online dating prospects; for scientists to develop new kinds of ovulation detection kits; or for marketers to target sales of clothes and jewellery.

Why does ovulation change women's behavior in such subtle yet fundamental ways? Experts propose that it's an innate and subtle strategy to both attract the most desirable guys and convince them to stick around for the long haul.

"The idea is that women turn up everything that has to do with femininity" at ovulation,

Scientists have been intrigued by the claims of some women who insist that they can 'think themselves to orgasm', all by themselves.

A few years ago, researchers began working with brain imaging scanners to show what is actually happening in a woman's brain during orgasm.

"The pleasure centres of the brain associated with orgasm light up in women who think themselves to orgasm in exactly the same way as in women who orgasm through more conventional means," says Barry Komisaruk, who co-authored The Science Of Orgasm, reports the Daily Mail.

New Delhi: Taking your lady for a trip away from home will certainly earn you some brownie points, because heading off on holiday is a far bigger turn-on for women than sex.

A trip away topped a poll to find the most exciting things in a woman's life, followed by becoming a mum.

Romping with a loved one was third, followed by a pay rise and backing a winner on the horses in fifth.

It may come as a surprise to many people, but the most desirable length for sex is just 10 minutes, a survey of has revealed.

A survey of 50 members of the Society for Sex Threapy and Research, who counsel and treat couples with sexual problems, said that between one and two minutes was too short, three to seven minutes was acceptable, and anything over 13 minutes was too long.

The added that sex lasting between seven and 13 minutes was "desirable".

Contrary to popular fantasy about the need for hours of passionate activity, sex therapists say around ten minutes is perfectly satisfactory.

Adolescents who have sex with their romantic partners do not perform poorly in academics, found a new study.

However, the same doesn’t hold true for sexual intercourse outside of romantic relationships.

Titled, ‘Sex and School: Adolescent Sexual Intercourse and Education’, the study found that the context in which adolescent sexual activity occurs can substantially moderate the negative relationship between sexual intercourse and education.

"Compared to abstinence, sexual intercourse in committed romantic relationships is often academically harmless, whereas in other types of relationships it is more detrimental," said Bill McCarthy and Eric Grodsky, sociologists at the University of California-Davis and the University of Minnesota, respectively.

New Delhi: India has decided to step up its female condom (FC) programme in a big way in a bid to control the spread of HIV among women. With nearly 50% of the 1.7 lakh fresh cases of HIV reported annually being women, the drive will be expanded from eight states to 17 in the next few months.

Though NACO buys FC at over Rs 20 a piece from Hindustan Latex Limited (HLL), it provides them to female sex workers (FSW) for only Rs 3.50 each.

As of now, FC is being made available to FSWs in Tamil Nadu, Andhra Pradesh, West Bengal, Maharashtra, Bihar, Jharkhand, Orissa and Rajasthan.

London: A 25-year-old British blonde has boasted that she has slept with 5,000 men and says she doesn't "want to be cured" even if she is considered a sex addict.

Nikki Lee has had sex in nightclubs, alleyways, parks, cinemas and discotheques. She has also gone on sex holidays, where she did it in clubs, on beaches and on balconies.