Beating him to it isn't going to make you feel better. And it'll give him justification fuel to do so. Let him flush it down the tubes awhile first. Look at it this way: is it really such a personal success on his (or any WASs) part to find someone to have casual sex with? Where I live, no. It's the easiest thing for any male or female no matter how lowly or unattractive to do. It is one block and two beers away at all times.