I probably would go for guys, if I woke up as a woman one day and never changed back. Hell, I'd change my name, throw on some makeup, a nice cute skirt and live my life. xD
It's not because that's what's expected of me, it's because that's how I am, today, as a man. I do find myself attracted to both genders, though I do have a preference for females. However, in my current situation, I'd never abandon my pair. We're too close for a sudden change of gender to change anything between us. :3
But if something happened to her, I'd just begin dating guys like any woman would, and I would probably keep dating women too, equally. (I hope it doesn't turn out that way though.)
For me, love doesn't really get defined by what I lust for. I only tend to fall in love with my friends, or people I feel are my friends. So yeah, i'd have to forge at least a small level of friendship with anyone I'm looking at as far as dating goes, and I do that as I am now. :3