FFM is certainly a thing possible in the swim practice scene, or if you're polyamorous and invite a couple female partners for a polycule hangout. For the other scenes I know the genders of the characters can be influenced by the player. Like at the very start you can choose to make the gender distribution of your world all/mostly female, and make your character a hetero guy so characters with predetermined genders are more likely to be female. Though that stuff is kind of "in theory" for me, as I usually play a bi female with even gender distribution :)