When I was 19 I started dating a man who was in his late 30s. He was talking about having a fetish for older women and how he didn't know how he would date a younger woman this time. I have seen pictures of his exes and they were indeed older.

However, over the course of the relationship he started developing a fetish for younger women and teens. This was because of the exposure to me..

When you think about it some fetishes make no sense from an evolutionary perspective. Being attracted to very older women or very fat chicks is not optimal for child creation. I ha e this pet theory that these men romanticize what they think is sexually available. If they have a lot of experience with fsf chicks they tend to romanticize fat chicks. If they have experience with older women they tend to romanticize older women etc.