5_fingers abs animal_genitalia anthro balls big_balls big_penis black_body black_fur bodily_fluids clothing coat cum cumshot ejaculation erection fingers fur genital_fluids genitals glans hair hand_in_pocket humanoid_genitalia humanoid_penis inner_ear_fluff lab_coat looking_at_viewer low-angle_view machine male masturbation mug muscular muscular_anthro muscular_male neck_tuft nipples nude open_mouth pecs penile penile_masturbation penis pockets protogen_visor purple_eyes purple_glans purple_nipples purple_penis purple_tongue saggy_balls saliva saliva_string sheath simple_background solo taker_pov throbbing_penis tongue tongue_out topwear tuft vein veiny_penis stilldownhorrendous protogen absurd_res hi_res
[b]Very[/b] important part of the scientific[b]*[/b] process

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