There is a official gender icon for andromorphs/c-boys, but sadly I don't think gynomorphs/futas have one yet. Though I do have an idea to offer them for one.
I'm very aware of the gender icons, but I actually need the opposite, I need something to describe the reproductive organs! So the player can easily spot who can be pregnant and who can inseminate. But I'm roughly going with icons like: egg vs sperm cell. Works for all creatures UwU
As for the genders, they're not really used for the moment in the game since I don't planned to add dynamic dialogues, but who knows!!