Procrastacoitus

Procrastacoitus
n. Latin. derived from procrastinus (for tomorrow) and coitus (to copulate) of modern Anglo-Australian roots

The act of procrastinating by engaging in sexual activity when one should be performing tasks of less enjoyment but greater importance.

Boy: I don't want to study anymore, its boring.
Girl: Me neither, wanna kill some time doing adult activities?

Boy: Hells yeah!
Girl: Come here tiger...

Next minute the two are engaged in procrastacoitus