To conduct love making in a manner that is wild,
passionate,
animalistic, and perhaps even humorous. Lovemaking as a primitive, resonant visceral experience.
(Mutual fulfillment seems to be a key component of monkeylove, versus a rape or mindless coitus in which only the guy gets anything out of it.)
Somewhat related to the idea in the Cool & The Gang song, "
Jungle Boogy".