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80s film about body's taken over by aliens

In the film it starts with a man in bed with his other half then the man somehow gets taken over by an alien.  The only way you know they are aliens is when the reach climax they start to glow bright white.  A female Dr then tries to find an alien by sleeping around to find one.  Think there was something about they liked to ear before sex also.
asked Oct 8, 2016 in Name That Adult (XXX) by Kdb550 (1 point)
This sounds like "Cocoon" directed by Ron Howard.
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