r4r

Stands for "redditor for redditor".

Used on Reddit to identify posts and areas of interest related to meeting other people.
"Please, don't ask for r4r in r/sex, this subreddit is only for discussions about sexuality and sexual relationships"
by JohnShaft August 30, 2018
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CNM

Stands for "consensual non-monogamy", a form of relationship in which an individual is attached romantically or sexually with one of more partner with the knowledge and consent from the rest.
We are in a CNM: we're married, but we go to sex parties to fuck and have fun with other people. It's a blast.
by JohnShaft September 03, 2018
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