As other threads have mentioned, M3 isn't exactly a chick magnet. You get more dudes attention if anything. For certain types of girls, just saying you have a BMW is enough. I don't think most of them care to know if its a 328 or an M3 as long as it looks nice and expensive.
2003 Cobra -> 2010 BMW e90 M3 - Space Grey - Black on Carbon Leather Int. - BRILLIANT CAR!!