Lifeforce

Description for LIFEFORCE by Colin Wilson:

WILL THE EARTH EVER BE THE SAME?

The derelict spaceship was vast, and like the landscape of a deeply disturbing dream.  Equally strange was the immobile bodies of the humanoid passengers discovered by Captain Carlsen and his men.  Later, when three of the aliens had been transported to earth, the oddity became a nightmare.  The beings were energy vampires whose seductive embraces were fatal, whose eroticism few humans could resist.  As their lust for lifeforce remained insatiable and sexual murders spread, Carlsen fought to discover who they were and how to destroy them---before their evil hungers contaminated all of mankind and Carlsen himself became the willing victim of the most beautiful irresistible alien of them all.