It was some show like The Twighlight Zone. Saw it in maybe the late 90's, or very early 2000's, I'd say filmed around that time.

Anyways the show ends with this sloot demanding sex from a dude she's been hooking up with, but he declines and says he's not in the mood to have sex with her 24/7. She responds by slaughtering him and then releasing huge swarms of baby fly creatures from her that were apparently made thanks to her tricking him into sex after she invaded the planet and then diguised herself as a hot human female.