Find out what makes men

After spraying 'love hormones' into the nose, most men will feel uncomfortable when attractive women approach them.

Oxytocin, called 'love hormone' , promotes the bonding of mother-child and male-female emotions. Many studies show that after smelling oxytocin, people become more homosexual - an important factor to make friends and establish long-term emotional relationships.

Scientists at the University of Bonn in Germany recruit a group of married men or in love to perform an experiment on the effects of oxytocin on men's perceptions of women. They asked volunteers to spray a dose of oxytocin into the nose before seeing a beautiful girl. The girl moves constantly to change the distance between her and the male group. Experts then asked volunteers to assess their comfort level on a paper scale.

The team found that the distance between the girl and this group of men was farther away, the more comfortable the guys were. Married men always keep a minimum distance of 10cm compared to girls, Science Daily reported.

As the girl approached to ask some questions, the level of discomfort among married men increased.

'Because oxytocin is capable of increasing the level of trust in humans, we guess men who spray oxytocin will allow the girl to get close to them, but the opposite happened,' said Professor Rene Hurlemann, a member in the research team, said.

In another trial, experts asked a group of single men to spray oxytocin into the nose, a group of married men sprayed placebo. The results showed that when the girl approached to ask questions, volunteers in both groups were comfortable.

The team said that oxytocin could become a measure of men's faithfulness. It indicates whether men really love their wives or girlfriends. If married men or lovers are not really in love with their other half, oxytocin will not make them feel uncomfortable when women get close.

A previous study demonstrated that oxytocin is a substance that plays an important role in the level of fidelity in the animal world.

'With this study, we provide the first evidence that oxytocin can play a similar role to humans. Other factors are not dependent on oxytocin content ' , Hurlemann commented.