That'd probably require a lot of work on the back end, to make it work in terms of the character model, animations, proportions, etc.

Whatever the case, though: Are you people serious? Putting down an idea because ERP exists? Sweeties, honeys: we're playing a game where you can be a magic bikini catgirl dueling a bishonen space marine and solve mysteries with a clothing damage-prone trophy husbando and his naked dad, and once attempted to get help from a geriatric lizard by having an elf cosplay his vore fetishist girlfriend.

What I'm saying is, if you think along those lines, you might as well call yourself the Fun Police.