Demon Terror (2000)

The German low-budget horror flick Dämonenbrut (2000) tells the story of a group of thugs (Thomas Riehn, Marion Ley, and Carsten Ruthmann) who, after robbing a bank, take a hostage (Anja Gebel) and escape to an island. But the island is inhabited by a horde of demonic creatures, led by Katja Bienert, who are out to kill the men and impregnate the women by penetrating them with their tentacles. There is tons of nudity throughout and explicit scenes of vaginal-tentacle penetration. Monster-human sex alert!