Wtf is this shiit. The only thing girls seem to notice about cars is 1) If the guy they're with drives in what they consider to be an immature fashion and 2) If the car is immature: yellow, chrome wheels, too loud, annoying stereo, or in any other way "young" looking.
The RX-8 is a bit young looking, but it's really not that big of a deal.
In all my years I only met one girl who really commented on how she liked my car. What she really liked is beating the crap out of high-revving stick shift cars. She's a unique one!