Well, here's a couple of them....
-The Terror Within (1989), zombie like humanoids on a desert apocalipse kill the men and have sex with the women who get pregnant...a la ALIEN style...not so graphic, but one of the crew girl gets knocked up fast. semi-graphic
-The Terror Within 2: (1992) The sequel....of the first obviously..a scene actually shows her getting humped doggy style, and later, they show normal sperm, and then alien sperm attacking the egg (under the microsope).
-X-tro (1982), where a women is raped in the mouth, and gives birth to an adulte alien. Extremely graphic.
- Galaxy of Terror, where a female astraunault gets raped (graphically) by a huge worm....
- Aquanoids (2003), (foreign movie from europe, need multizone), humanoids are invading and killing men, one girl gets wisked away only to be found later with a weird alien in her belly, weirdly, she's completely naked when giving birth..!
- The Beast Within (1982), a monster gets loose, rapes a woman on her honeymoon night, 20 yrs later, the offspring goes on a killing spree, rapes another young girl for his offspring to continue (graphic rape scenes with full frontal nudity)
- Breeder (1980), where nice boobied girls (and bushy in that time period) are misteriously getting raped (graphically) by a beast and they all meet at the end in a pond of goo..
- Breeders (1990 remake), same story, but better acting and actually is good.
- Humanoids From The Deep (1990 remake), where you only see the butt naked girls in some sort of crysallis which is impregnating them!
Thats all I can think off my head for now, if I remember others, I'll come back..!
Sex is like a game of cards, if you don't have a good partner, you better have a good hand!
What is a good site to look up the monster-rape genre, because it would be nice if wikipedia had a category for it, rather than just normal human rape films :( .
Also would be best if it were on nextflix or Hulu.
But to add to the list sorta, one of the first I remember was Hallow-Man. The invisable man unbuttons his Hot piece of ass female lab assistant's top & plays with her boob, I just wish they had her pop out both of them. But the reason I like this is because he invisable rapes his next door neighbor, one of the Lara Crofts, & while he is raiding her tomb, her "twin-pistols" are flopping around. Lara F-ing Croft, getting F-ed & showing boobs. the REAL Lara, not this reboot joke.
Another scene I liked was the Dagon movie. the naked girlfriend is lowered into the pit, comes back up cover in goo, & then it grabs her & rips her arms off. & since Dagon is a god, she obviously survives & is being raped, probly forever, with no arms.
also, The Incubus with John Cassavetes