Any time I met a guy who didn’t respond to me sexually, it would make me determined to have him,” confesses Valerie, 35, a human-resources manager in the City. “It became a challenge, a game, regardless of whether he was married or with someone. The lowest point came when I tried to seduce my best friend’s fiancé. I couldn’t bear the fact that, when they were together, he wouldn’t so much as look at me. It was an itch I had to scratch.”