Fluid bonding

Fluid bonding is the practice of sexual partners who explicitly choose to expose themselves to each other's bodily fluids. Where there are exactly two fluid bonded partners, the term fluid monogamy is used. However, larger groups of people have been known to take part in fluid-bonded polyamorous relationships.

Concept
Fluid-bonding in concept is where both partners agree not to exchange fluids (other than saliva, unless someone has mono) with anyone for 6 months. At the end of 6 months each partner gets screened for all sexually transmitted diseases (including HIV). If both partners test negative for all diseases, the pair is then free to exchange fluids with the other person and the pair is then defined to be "fluid-bonded". One can expand fluid-bonds to include other people as well, simply by going through the same process with other people (a general exception is one can have unbarriered sex with someone one is fluid-bonded to already).

Motivation for
The usual motivating factor is greater enjoyment of sex without barriers, latex or otherwise. Fluid bonding is often performed after both partners have taken an sexually-transmitted infection (STI) test, although some have even been willing to acquire a condition of their long-term partners in order to increase physical intimacy.

Since fluid exposure is a conduit for STIs, by taking part in fluid bonding, participants are effectively trusting their sexual partners with their health. Avoidance of third-party sex, or at the least strict protective behavior with any third partners becomes more important. Clearly, the risks of belonging to a fluid-bonded group are directly related to the size of that group.