between the sheets
1. Literally, in bed. It was such a long day today, I can't wait to get between the sheets tonight.
2. Of or pertaining to sex. In polite company, one does not discuss what happens between the sheets.
between the sheets
of, at, or related to sexual intercourse. informal euphemistic 2005 Montreal Mirror Terror and oppression in managed circumstances are sexy for some folks, and let's face it, we need all the help we can get keeping things lively between the sheets.