Tonicadic

Tonicadic is a choice in nature gender that one chooses to introduce to one's hoard that doesn't take energy to use and is always there passively, but one wants to use it because one likes the aesthetic/feeling/etc. One can "unequip" the gender, and "re-equip" it whenever one has access to their internal gender hoard. Excess use of it leads to gender-fatigue. There’s a limited amount of chosen genders one can have equipped at once. Adding too many could be unhealthy.

It's based on the Bioshock game franchise.