tyrannosaurus-sex

When you have sex without the use of your arms.

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?

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