There's a drop down menu when you meet Susan Storm - you can choose between "Mr." or "Miss" to select your gender. Up until that point the game is written to allow for either gender, and after that descriptions and dialog vary based on that selection.
I'll seriously consider it. It'll be a bit of extra effort but not terribly bad, so if you're reading these comments and agree with EponymousKay, speak up in support.
Note that it'd be significantly more work to include male love interests, so if players can select gender it'll be a choice between heterosexual males or lesbian females. That's exactly the kind of scope creep I've been trying to avoid. :D
