The second being that men often base their expectations from your behavior. If I was too eager to allow him to kiss me then he might assume that I was eager for the sex as well. I admit, I was a bit of a prude. Those were my reasons. It may sound silly now but in my mind it made sense and it also left me with some type of control. However, as the relationship between men and women becomes more liberated and less structured I wonder does it matter anymore whether you wait to kiss or not?