This is why we really have oral sex, according to scientists

FOREPLAY feels good but that’s not the real reason we have oral sex.

By Sarah Buchanan

Men and women don’t just engage in oral sex as a warm-up to the big act, there’s some hard science behind the sexual exchange.

Going down has become just or perhaps more popular than sex nowadays because it doesn’t lead to pregnancy, but it does actually serve an evolutionary purpose for both men and women.

According to a study published in the Journal of Reproductive Immunology, the reason women perform oral sex on men is because swallowing semen can make your body become accustomed to someone’s DNA.

This is helpful for the immune system during pregnancy because the woman’s body won’t view the man’s genes as “foreign”.

Disorders during pregnancy are often because the body thinks the foetus is a “foreign body” but thanks to swallowing sperm you can acclimatise yourself to the new DNA.

As for why men pleasure women, a study found that giving oral sex is proven to stop ladies from cheating – and the more they get the less likely they are to play away.

Researchers at Oakland University quizzed 243 heterosexual men in relationships to see whether they performed cunnilingus to make their partner feel more satisfied in the sack.

They found that men are more likely to perform oral sex if they think their partner is attractive and at risk of being seduced by another man.

To prevent a woman from straying, men make an effort in the bedroom by making her orgasm through oral.

From an evolutionary angle, this prevents sperm competition which is basically when another man tries to muscle in on your partner.

Also, getting a woman pregnant means the man is more likely to pass on his genes.

SEXY SCIENCE: There's a biological reason why we give and receive oral

The news comes after a recent study revealed there’s an “oral sex gap” between women giving and receiving.

According to a new survey called “Was it good for you too?” men are more likely to receive oral sex but not return the favour.

The study found that 63% of lads said they’d received oral during their last sexual encounter compared to just 44% of women.

Researchers also discovered that more ladies (59%) than men (52%) reported performing oral sex on their partner.