3d_(artwork)
3d_animation
4:3
ambiguous_gender
animated
animated_gif
butt
combine
digital_media_(artwork)
drakansix777
drsix777
duo
erection
genitals
half-life
humanoid
humanoid_genitalia
humanoid_penis
low_res
male
penetration
penis
sex
short_playtime
valve
valve_corporation
