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16:9
3d_(artwork)
3d_animation
alien
ambiguous_gender
animated
barnacle_(hl)
bestiality
civil_protection_(half-life_2)
digital_media_(artwork)
duo
fellatio
feral
feral_penetrated
half-life
high_framerate
human
human_on_feral
human_penetrating
human_penetrating_feral
interspecies
loop
male
male/ambiguous
male_on_feral
mammal
nightmare_fuel
no_sound
oral
penetration
penile
reipastdusk
sex
short_playtime
source_filmmaker_(artwork)
teratophilia
valve
valve_corporation
video
widescreen