Great thread.. I think my enjoyment of the smell of sex is directly related to the experience that was tied to it. For instance, I can remember walking into my bedroom the next day and thinking "Oh god, that's awful" after a one night stand, but at the same time, i had a car in high school that always smelled like sex and it didn't bother me the slightest.
Of course, living in sin like i do, i hardly notice anymore