A lot of life is symbiotic. Most animals can’t exist without plants and some plants can’t exist without animals and some plants can’t exist without other plants and the same with some animals. And this can be extended to bacteria.
For evolution to even occur in most animals, there is a requirement for a male to meet a female and for them to get along, (at least for a bit), or be tempted or for one to dominate the other. This practise needs to be so powerful and independent, that no amount of change (in the animal or environment etc.) can prevent it. Evolution has enabled some extreme changes in order to keep this magnetic force going. Some moths (e.g. which may be rare or not spatially close) can detect a partner 7 miles away. Similar effects occur with sound in mammals. Whales can be heard over a hundred miles away, and wolves, sloths, foxes, cats etc. all have distinct sounds that can be detected far away, e.g. as a warning or to attract a mate.
When did people first link the act of copulation with pregnancy? There is no doubt that by linking the two and also knowing how the process works and by implication how to stop it, has significantly affected human evolution and as we can now screen genetic variations/abnormalities and may extend this in future to choosing eye or hair colour etc. Remember Adolf, the tall, blond haired, blue eyed Adonis who ruled Germany and wanted to create a perfect Arian race?
Is it possible that any other animals link copulation with pregnancy? Naturalistically, many animals naturally (without learning) look after their young and can control their temperament, e.g. between family and hunting. Some fish/birds/reptiles etc. can return to the same place thousands of miles away (migration in winter or spawning/laying eggs/mating), without any logical or learned way of actually knowing it.
I wonder how much the effect of war paint or gyms, fashion or sweet shops and fast food, cosmetic surgery (to name but a few factors) have affected human evolution in the selection process?
Sex, whilst a wonder of nature, is pretty well understood in terms of what the body does and feels or produces to arouse the desires it does, as many nature documentaries like to show, be it on the farm, at the zoo or in the wild. Some animals can die of exhaustion (or get eaten) in the process. Some do it once in a lifetime, others live only for it and others die soon after it. Some individuals never do it for various reasons and some do it in a way that is not pro-creative or for the entertainment of self or others.
In a time when man did not see the link between the act and the pro-creative result of intercourse, (and in a time when there were no hospitals or medical practitioners), [when was this and/or how old is contraception?] if women hoped or feared for having a child and if they thought it was down to a god or prayer or a certain time or luck or worth or if it was related to something they did or how good or bad they were? Did they even link it to being with a partner or being in a relationship as opposed to being single/being a virgin? Imagine being a woman and witnessing a horrifically painful birth or even a still birth, how scared you must be all the time.
Thanks to science for all their advancements and for making life so much easier and more comfortable and safe and long and happy and ….