TinySex

TinySex, also known as TS or tiny.sex and other variations, is a specific subset of Cybersex. Cybersex refers to a virtual sex encounter in which two or more persons connected remotely via a computer network send one another sexually explicit messages describing a sexual experience. It is a form of role-playing in which the participants pretend they are having actual sexual relations. In one iteration, this fantasy sex is accomplished by the participants describing their actions and responding to their chat partners in a mostly written form designed to stimulate their own sexual feelings and fantasies.

TinySex is mostly used to describe Cybersex on TinyMUDs, MUCKs, MUSHes, and sometimes IRC.

TinySex between furs is colloquially referred to as yiffing although yiffing itself is not restricted to TinySex.

Origins
TinySex's origins are related to the social MUD branch's use of the TinyMUD name and habit of players to refer to everything in the game with the prefix tiny-. An example is the term tinybody used to refer to the body of a TinyMUD character.

The prefix tiny- itself is no longer in heavy usage, however the term TinySex stuck.

Variants
Typefuck is a sarcastic and sometimes sardonic term used to playfully describe the online roleplay of sex, when describing the act in a place such as a MUD, MUCK, or IRC.