FURVERT!

2_penises alien anthro anus backsack balls bodily_fluids brown_balls butt claws crotch_tentacles cum cum_on_penis erection genital_fluids genitals grey_background hi_res humanoid male monster multi_genitalia multi_penis multicolored_penis nude penis prehensile_penis presenting simple_background sinsmonster solo tapering_penis tentacles two_tone_penis unknown_species what what_has_science_done why