I'm in the "step through bikes are unisex" club. As others have said this "womens verses mens" frame design thing got started so women could ride in skirts and did not need to sling their leg over the seat, which would not be very lady like at that time. Times have changed and I can't understand why any bicycle manufacturer would continue referring to step through frames as womens bikes and standard diamond frames as mens frames. I know a lot of women that ride "mens" diamond frame road bikes due to the fact that a step through frame would never be a good design for racing. Step through frames are good for people with limited range of motion or where you load the bicycle with large items which prevents swinging a leg over the seat.