Plasmidic

Plasmidic is a choice in nature gender that one chooses to introduce to one's hoard that takes energy to use and isn't always there, 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 is based on the Bioshock game franchise.