White is one of the best choices I've ever made.
I've always naturally thought of it as a more feminine colour. Ironically I don't understand why people don't understand that theory, I live in a big city and would rarely see men with white phones, only women.
HOWEVER, the iPhone 4S is a game changer for that. I love it, in fact I can't stop looking at it.
The following might explain why some people associate it with women: I pulled it out at work yesterday for the first time, a big office, and Im the first person to get the White iPhone. The first few things I heard were 'it looks gay'. But it was all in jest. After a few minutes looking at it, that feeling disappears and to most people it looks damn cool.