Alien movie with lesbians?

and no its not called alien prey. its got a blonde and a red head and i cant remember the name of it. aliens come to earth and need to refuel by killing humans at the moment of orgasm. i think the redhead is a singer, and the blonde wears all these costumes. the redhead is taken in the end the blonde gets taken too.

Someone asked this on another site and i kinda remember seeing it but i cant remember the name and no one answered her question yet so now its bugging me and i wanna know too =)

oh yeah and its from mid-late 80's early 90's....

Is it "Liquid Sky" (1982)?

IMDB summary:
Invisible aliens in a tiny flying saucer come to Earth looking for heroin. They land on top of a New York apartment inhabited by a drug dealer and her female, androgynous, bisexual nymphomaniac lover, a fashion model. The aliens soon find the human pheromones created in the brain during orgasm preferable to heroin, and the model's casual sex partners begin to disappear. This increasingly bizarre scenario is observed by a lonely woman in the building across the street, a German scientist who is following the aliens, and an equally androgynous, drug-addicted male model. Both models are played by Anne Carlisle, in a dual role. Darkly funny and thoroughly weird.
http://www.imdb.com/title/tt0085852/

Perhaps that's not it since the date of release doesn't gibe with yours.

we have same problem...i know i watch that movie but just cant remember the title...

Earth girls are Easy ? with Julie Brown

the only one I can think of is the movie "Decoys" it sounds like what you're describing.
It came out a little later than you say so it may not be it

http://www.imdb.com/title/tt0357585/

species?