In Europe, many commuting bikes for MEN have what is called a "mixte" frame. Americans would say it looks like a GIRL'S bike. Men who ride in heavy urban traffic like a mixte frame because they are easy to mount and dismount at stop signs and stop lights in urban traffic. When you are carrying a heavily loaded rack on the back of the bike, swinging a leg over can get difficult - on a mixte, just step into the bike.
I gave a friend of mine a 1985ish Schwinn Three-Speed "Girl's" bike that I got cheap on E-Bay. I gave it a "test ride", and thought that it rode and handled as nicely as any men's three-speed I have been on. She has several nice bikes, but her "girl's" bike has become her favorite for shopping and neighborhood riding.
When I visit a friend of mine, I often borrow her "girl's" beach cruiser. Has that "rock steady" beach cruiser ride. And, I don't worry about it getting stolen while I'm in Krogers. What self-respecting crook would want to be seen riding on a "girl's" bike?
Rivendell is introducing a Mixte model that uses investment cast lugs. It is probably about the highest quality Mixte frame to ever be sold in the USA. And, the price fully reflects the quality.