Still a virgin? Well how old are you?

Well, a lot of chemicals play a role in sex. Of course there's the obvious estrogen and testosterone, but usually when someone uses the term "bonding chemical" they're referring to oxytocin. Oxytocin plays a very big role in sexuality. It plays a strong role in feelings of trust, closeness, intimacy, and love, and we basically love this stuff. Apart from making us feel fantastic (producing a sense of euphoria and pleasure), in women oxytocin also affects orgasm, lactation, and overall mood. Testosterone in males (or in females with higher levels) inhibits some of the reuptake of oxytocin, which is generally believed to be an evolutionary trait attributed to the fact that women have a 9 month gestation period, and during that 9 months the male could impregnate more females. (More babies = better chance of survival)

That's likely where the misconception that men are COMPLETELY unaffected by oxytocin would have come from. There have been extensive studies that correlate the release of oxytocin with various parts of the brain, in both males and females, to varying degrees.

When you have butterflies in your stomach from seeing your crush, when you feel SO in love with your partner, when you have sex & orgasm, when you hold your newborn child, and at times during simple intimacy, oxytocin is released in varying amounts. (The amount released when you hold your first-born child is ridiculously off the charts) There are still many studies being done, as it's difficult for scientists to determine all the varied effects and just how big a role it plays in our relationships, but we have learned a lot so far.