I think people think of it as a girl's car because:
A) They buy the Boxster when they can't afford a 911.
B) If the 911 is a man's car when only a man can afford it, the Boxster slots under it so it's obviously a wussie's car.
Same thing happens with the Mazda MX-5. I don't agree with the thinking of this because they're obviously sports cars made to appeal to different groups of people. The Cayman I actually like very much.