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.
A final note: the film bears no connection with the Nintendo Entertainment System game Life Force, which is in fact.
The big deal is not so much the quality of the scene, but rather the insane groundlessness of it all.
Interestingly, Linnea refuses to appear completely nude in her films.
This scene, at least, must be at least partially knowing.
The plot unfolds, and Stewart ends up in a wheelchair; minutes later, he kisses Steve Railsback.