Mean, angry, violent sex. This can take the form of dominatrix. However, it most commonly involves the use of handcuffs, various positions, and several painful, but sexual, acts.
After breaking up with my girlfriend, I met up with some girl for tyrannosaurussex.
Dave: Oi Jim, basically i'm very, very horny and would very much like to have sexual relations with you.
Jim: Well that's just splendid Dave, however i'm afraid to report that my arm is in the most horrendous state of pain.
Dave: Why Jim, that shan't be a restricting factor in our sexcapades, one does not need to use ones arms whilst making love...
Jim: How absurd! However do you mean Dave?
Dave: Well Jim old boy...have you heard of Tyrannosaurus-Sex?