Alien body snatcher tries to be like humans?

Its an old one but the only thing i can remember is an alien thing escapes somewhere and takes over a womans body and tries to be like other humans to blend in so its not caught, then another woman spots her immitating her and questions her and offers to help her, in the end the alien takes over a boys body and they have sex a bunch of times, was just wondering if anyone could help?

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