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16:9 3d_(artwork)3d_animation alien animated anthro armor bench civil_protection_(half-life_2)clothed clothed/nude clothed_human clothed_male clothed_sex clothing combine digital_media_(artwork)duo fellatio gas_mask genitals half-life half-life_2 hand_on_head hi_res human human_on_humanoid humanoid interspecies male male/male male_on_humanoid mammal mask no_sound nude nude_humanoid nude_male oral penile penis penis_poking_out penis_through_fly public public_sex questionable_consent sex sfm-for-dummies short_playtime sitting source_filmmaker_(artwork)valve valve_corporation video vortigaunt widescreen