The imaginary sweater that keeps you warm after heated sex. Dependening on the weather, it usually only lasts about 15 minutes after sex.
Q- Aren't you cold?

A- No, I'm wearing my sex sweater.
by Owner of a Sex Sweater January 15, 2011
Get the Sex Sweater mug.
1. When two individuals engage in sexual intercourse whilst only wearing a sweater
I have a sweater fetish, so obviously I love sweater sex.
by familyguyrox4377 January 8, 2011
Get the sweater sex mug.