rape tdm?
someone out there finds that arousing
A certain ratio of people are mutalids with the ability to rape. The remaining are normal, have no ability to rape, and have weapons.
Once a normal person gets raped, they will eventually gib and then respawn at the same location as a mutalid.
Once all of the humans have been transformed into mutalids, or once all the mutalids die, then it's a win.