Hard to believe? Research says it's true.

Be it behind the bike sheds or at the school disco, you are more likely to remember your first romantic kiss with your partner, more so than losing your virginity.

Scientists have claimed that most of us can recall 90 per cent of the details of the experience -- a memory more vivid than losing their virginity, reports the Daily Mail.

But, the art is so complex that scientist Sheril Kirshenbaum has written a book about it.

In The Science of Kissing: What Our Lips Are Telling Us, Kirshenbaum writes that men see kissing "as a means to an end" and possibly with a "view to swapping other bodily fluids later".

Women try to "extricate the significance of a relationship based on a single kiss and often that leads to miscommunication."

Men are more aggressive kissers, as they are trying to pass on a "testosterone bomb" to a lover.

However, testosterone passed on during sessions of smaller but frequent kisses stays in the body longer, and can push a woman to falling in love more quickly.

The author, a researcher at the University of Texas, measured the magnetic current in brains of men and women in response to images of people kissing.

Photograph: Javer/Wikimedia Commons