Playing as a girl because you want to look at a female is pretty objectifying. People calling you gay because you play a female character is just stupid and homophobic. Playing a female character expressly to "do lesbian stuff" is also objectifying and homophobic. The worst part of it all, though, is that I see a lot of guys who feel like they need to justify the desire to play a female with one of those bad reasons. "No guys, I'm not gay! I'm just as degrading and offensive when I play a female character!"
I don't mean to accuse anyone here of anything. Just sharing some of my thoughts. Maybe I'll drop and essay on the subject on this thread if I find the time.
Now, I play a female in basically every game I get a choice. Sometimes I refuse to play a game because I'm forced to be a male (Fable). If I'm given a choice, I always select the lesbian romance option. If I only have heterosexual romance options, I will often forgo the romance subplot entirely. Like in Harvest Moon, even. I even skipped the romance in Mass Effect on the grounds that it was not lesbian enough. I also skipped it in Dragon Age, but that's because the "lesbian" romance was more a "I totally like girls, but only to amuse men, and I can be cured of the gay as long as a big strong man shows me my place" kind of thing than a lesbian romance. I hate BioWare, by the way.