We then see breasts and butt when she throws the covers aside and gets out of bed to walk into a bathroom.
Cinema in the Seventies was basically one long nude scene; it would be easier to list films without nudity than with.
As might be ascertained from the title of the Colin Wilson novel on which it's based The Space Vampires , the film casts May as an undead alien who comes to Earth to feed on the life energy of human beings, and makes her job that bit easier by taking the form of a beautiful young woman with a severe aversion to clothing.