Saliva has testosterone and estrogen. When you kiss, you're having a chemical experience.
Kissing is not just kissing. It is a major escalation or de-escalation point in a powerful process of mate choice.
Overdone lipstick is a deterrent to men. It rubs off easily onto their skin and the edges of their shirts, so it discourages them from kissing, touching, and coming closer to you, which is what they really want to do!
Women apparently are quite drawn to men who have differences rather than similarities in their histocompatibility system. They pick it up by smell, and they can pick it up from kissing.
