Psychological pleasures
1. Anticipation For Sex
A man is attracted to women because he anticipates sex. His instinct tells him that they will give him sexual pleasure. People like something when somehow it gives them enjoyment, and sexual pleasure is the most intense form of enjoyment.
Anticipation for sexual pleasure is a pleasure in itself. It is what we call "being turned-on." For most guys big breasts are a turn-on. For most women a big penis is a turn-on. Not very complicated is it?