Sukia (Werewolf Transformation)

Sukia is an adult-themed Italian comic from the late 70s (though the only scans I could find are in Spanish). The title character is a vampire seductress and her assistant Gary is a flaming gay man--the first major homosexual character in Italian comics, distinguished for being proud and unashamedly promiscuous.

In issue 13 Gary turns into a werewolf, right when he's about to get it on with a hot guy:

Nothing spoils the mood like eating your partner. Poor Gary goes home to confess everything to Sukia. She tells him (I have no idea why) to sleep in the same bed as her and her boyfriend, and he of course transforms again...

Too bad the werewolf looks more like a stub-tailed ape than a canine. In case you're interested in the rest of the story, Gary kills another person and wakes up naked the next day. He hits a woman with a rock, steals her clothes and dresses in them, and gets picked up by a horny guy who makes Gary go down on him. Alas, in mid-fellatio he discovers Gary is actually a man and beats the shit out of him. Sukia learns about this and gets even with Gary's attacker by tracking him down, sucking his blood, and castrating him. She gives his severed penis to Gary as a present. He throws it out of the window and it's eaten by cats.

Ah, you might ask, but is Gary ever cured? Yes! They meet a professor who says that female werewolves have been cured by fucking male wolves, so a male werewolf would have to fuck a female wolf. Gary says he is not fucking anything female, so an alternative solution is found:

It works! Now if only this cure was more widely used...