When it came to the question of having sex on a first date if there was chemistry, 17 percent of the 20somethings said that was a possibility versus 28 percent of the and 29 percent of the somethings. The fact is that they do have other influences besides those mentioned above. Kylstra offered some additional thoughts via email on why young women are more conservative than one might imagine. The researchers think this is a response to declining fertility, but also noted it can simply be that older women are more comfortable with sex. Younger women will go out just for the sake of going out.