I was going to list the Superman/Wonder Woman porn flick, from ACTION COMICS 592-593.
And the Ms. Marvel mind control/rape/abduction/childbirth/incest in AVENGERS 200, by Michelinie and Perez.
On the latter, obviously Chris Claremont thought it was pretty icky too, and did his part to explain and halfway resolve the many loose ends, in AVENGERS ANNUAL 10 (1981), where a plenty-pissed off Ms. Marvel confronts the Avengers for not watching her back.
