HDoom

H-Doom is a pornographic modification of Doom gameplay that replaces Doom's weapon and enemy animations, as well as adding adult animations for the Doomguy. It's currently a tech demo, version v7 as of the latest build.

It can be played on The Ultimate Doom, Doom II, and Final Doom on PC, preferably under the Zandronum source port, though it will crash if certain enemies are killed, as the kill animations have been drastically altered to be "non-lethal" and those enemies that have not been changed to have new animation will causes crashes.