Why is it so easy to sleep with women in commited relationships?

I like the hunt. I hit on these women they tell me they've got a boyfriend and that just makes me want to bed them even more. And eventually I wear them down. Then I am done and they aren't. Why? Why can't these women stay loyal to their boyfriends. Why do they want me afterwards. I had this one woman come to my job afterwards. I learned to not share too much personal information after that one. This wouldn't he a problem if women were just loyal to their boyfriends.

Why is it so easy to sleep with women in commited relationships?
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