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Weight put on by a woman after she gets comfortable in a relationship and no longer feels like she has to look her best for him.
Jim: Did you notice that Patty in marketing is starting to get a little heavy lately? All of her clothes are starting to get too tight on her.
Sarah: Yeah, she's getting pretty serious with her new boyfriend and she's really starting to pack on the sex weight.

Karen: What do you mean you don't want to get dessert tonight?

Melissa: No, I think Mike is about to break up with me and I need to start losing all this sex weight I've put on since we started dating.
by Ernie Pantusso February 01, 2017
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