tpm, thrusts per minute

from Live Science:

Female monkeys may shout during sex to help their male partners climax, research now reveals.

Without these yells, male Barbary macaques almost never ejaculated, scientists found.

...

The researchers found that females yelled during 86 percent of all sexual encounters. When females shouted, males ejaculated 59 percent of the time. However, when females did not holler, males ejaculated less than 2 percent of the time.

To see if yelling resulted from how vigorous the sex was, the scientists counted the number of pelvic thrusts males gave and timed when they happened. They found when shouting occurred, thrusting increased. In other words, hollering led to more vigorous sex.

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