I bought mine because I've been in love with Porsches since I was 9yo. I love everything you mentioned performance, heritage, handling, character, but it's also a very sexy car and maybe that's what attracts some women. You can't look at a 911 and think that the lines on that car are not perfect (perfect a$$ right??). Maybe chix are just jealous of it....
Anyway I don't think the car is enough to pickup girls, but it sure helps a little.