A few weeks back I had this discussion with a female co-worker...She said she thought that the white iPhone was feminine or girly...I agreed with her, mainly because at that point I had never really seen a white iPhone other than the 3gs, I knew the white ip4 had been out for awhile but never saw it in pictures or in person.
Than that same weekend I went to the apple store and saw the white ip4 for the first time..Thought it was cool as heck.
A few weeks later I upgraded my black ip4 to a white ip4s 64 gig. No real regrets yet, although I do think the black can be less distracting for some things (i.e. looking at trippy apps like Trancit). Also, part of my decision was based on the fact that every previous phone I had was black, and I wanted a change.
As far as white being feminine or girly, after giving it some thought maybe we have George MIchael to blame: