Males have a puny orgasm. The female orgasm is thirty times greater.
There are good evolutionary reasons for this.
Firstly it is a good idea to exhaust the female so that she lies on her back for a period of time. This allows the sperm to be activated and swim out of the vagina into the relative safety of the uterus. If females got up and started walking about straight after sex then the sperm would end up on the floor.
Secondly the contractions of the uterus actively suck the sperm up into the uterus.
Hence it is a good idea for the male to come first and deposit the sperm prior to the female reaching an orgasm!
Evolution is a wondrous thing!!
The problem is that it has become too effective. Humans are no longer subjected to enough selection pressure. We have killed our predators, prevented disease and ensured lots of food and water. Hence we are producing more babies than we need and the population is spiralling out of control.
We need to put this right with intelligence.
Read about the effects of overpopulation in my book Anthropocene Apocalypse.