Sparing partner 

also see fuck buddy. Usually this is when its conveint for both parties when they are between significant partners.

joe: dude last night I went 3 rounds with my sparing partner.

Sparing partner by HRM SMK April 6, 2008

sleeping partner 

Someone with whom you go to sleep. Does not necessarily equate to sexual intimacy.

J is my boyfriend, but A is my sleeping partner.

sleeping partner by FayDixon January 14, 2008

Business Partner

A sexual business relationship.

DanEZPZ was doing bqscott, his Business Partner.

Business Partner by TheProhacker March 27, 2009

Sex partner 

That knows you from head to toe of your body and give you the best feeling that you never had in having sex with everyone you had been with through your life and it's great to find that in your life because everyone never gets to feel that and it's true because I have a partner that never felt that before and I was happy to be that person to make her dreams come true

She was the best blow i ever had and sex partner

Sex partner by Wildbill695 November 4, 2020

Discord Partner 

A special rank on Discord that special people with special large either Youtube, Reddit, or Twitch channels can get by having a Discord server and begging Discord staff to give them a rank (if you have at least 100k it'll work)

Carson: YOOO how did u get the Discord partner badge?
Phin: Oh ye, I just begged Mallory & Cilantrelle

Discord Partner by itsphin August 5, 2017

designated dance partner (DDP) 

A good friend who you can always find in the middle of the dancefloor when it is time to get down. No matter how the night is going, you can always count on them to be on the dancefloor busting moves with you.

The night really got going when I ran into my designated dance partner (DDP) Kelsey and she dragged me out on the dance floor.

designated dance partner (DDP) by LuckyLep December 16, 2011

Sexual partner 

That man or woman or person who shares all your most intimate sexual moments with you on a daily or long-term basis, he or she being of either sex, or, occasionally the same sex, or, sometimes, being a mix of sexes, or occasionally someone of no sex at all (but that does not often happen). In normal sexual relationships, mostly being someone of either one sex or another who, with his or her partner of choice, enjoy carnal knowledge of each other on a long-term basis, as according to the sexual preference of either partner.

Come, my dear, be my sexual partner, either for a day or two or maybe even the rest of our lives, or maybe even come skipping up the aisle with me and, with a bit of luck, and in the meantime, we’ll also have some fun between the sheets whenever we want to, weather permitting.

Sexual partner by Zamboozee May 4, 2011