Can you tell me the title of this movie? ?!

It is very modern looking, with lots of glamorous model suits and drug taking!. This main plot is about this model/druggie girl who acquires the power to make people disappear!. She makes her friend disappear when she asks--"Poof"!. The UFO in the movie is killing people by stealing the energy from their orgasms!. Anybody got an idea about the name of this movie!? I'm guessing it came out in the early 80's or the 70's!. Www@Enter-QA@Com

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