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Painful muscle spasms in the vagina as a response to pressure/contact. Sometimes has no known cause, and sometimes happens after psychological or physical trauma.

When people reach orgasm at the same time, which is generally rare.

A way of being polyamorous where regular, comfortable, and informal social connection and interaction between everyone in a polycule, is desired.

When a penis is inserted into and held by the anus while partners move their bodies as feels good to them for the purpose of sexual stimulation.

Something intimate or affectionate but not sexual.