fluid bond 

A relationship in which partners are monogamous only with respect to the exchange of bodily fluids. Other activity with other partners, like safe sex, BDSM play, a brisk walk, etc. may be allowed or negotiable.

Sure, you can fuck my ass, face, and pussy, in that order! You'll just have to use a condom - my husband and I are in a fluid bond.

fluid bond by vandalini January 28, 2010

fluid bonding 

To allow one's bodily fluids to mix with another person during sex without use of protection, such as a condom.

I told him I wouldn't have sex with him without a condom. Unless I'm in a relationship, I don't do fluid bonding.

fluid bonding by got ca milf April 18, 2009

Fluid Bonded 

bound by fluids. linked by fluids. fluids have passed between.

Jack fucked Jill bareback and he got
Gono-Syphla-Herpe-AIDS... A very bad thing!

Fluid Bonded by Alex Kyzer November 15, 2004