Topic summary
Yelling

Extracted from the Wikipedia article Screaming.
Screaming in pleasure
Screaming and yelling are also a means of expressing pleasure. Studies on monkeys have shown that when female monkeys scream during sex, it helps the male ejaculate. An approximation of 86 percent of the times where female monkeys screamed during a sexual encounter, brought a 59 percent success rate, in comparison to the 2 percent, without the female-scream.