Yes, the Collinson twins had been in Playboy in October, 1970 — and Hammer spied a smart commercial idea when they saw one — put them in a horror movie and make them wear lots of lingerie! Celebrities and actresses born between 1945 and 1984.
There apparently was also a 1974 French release with hardcore inserts from a different shoot of course.
Once you've traveled, you feel trapped there, and we're too free-thinking to conform to its customs and traditions.