Well, if speaking about monkeys, do it professionally.
A Gorilla male has the smallest dick in the ape family, and fucks some 10 seconds. because he managed to get rid of all other males. No competition = no quality.
https://www.youtube.com/watch?v=iDaHPi8HOGA
Chimpanzee males have a very modest dick, but XXXL balls. All males in the tribe have right to access a fem when she is red-hot. (Horny is a term too modest). Immediately, the boys form a queue. It is not the European kind of a queue. The rule is: Who's the first here? I am before you!
Each chimp gets some 30 seconds to cum. 30 seconds per boy, 10 to 15 boys, makes a quick and violent gangbang, and the one with the biggest balls has better chance to impregnate the girl and father a baby.
https://www.youtube.com/watch?v=j7W-aLZqM7o