Turd Ferguson wrote:A. Why don't human males have these biological barriers?
B. Furthermore, why do we beat off other species, especially when it is this complicated? Is it alturism? Or the selfish gene?
A. I think it's a sign that certain mammals (humans, apes) have a better and more powerful power of imagination. When you whack off, you need some imagination, otherwise it won't work. Elephants don't have that capacity, me reckons.
B. I don't know why other humans whack off other species. Some for science, some for breeding (agriculture, show animal creation, dog breeding, etc.) Some to entertain perverts, some to entertain thoughts.
I know why I used to beat my aunt's dog off. It was out of pure altruism. I did not have any sexual pleasure out of it. But I reckoned he did, (the dog, not my aunt), and that was good enough for me.
You had a third question: why some species develop the ability to whack off. I think it has got to do with having a survival and gene-propagation advantage of being ready to produce offspring at any time. Most mamals and birds have a mating season. They copulate only then. Some mammals like Chimpanzees and Humans, have random allowances by females for the male to produce offspring. So one has to be ready at any time, and that can't be achieved with a stagnant semen base. Because the pool of semen would literally rot in your scrotum. So you have to "flush" out the ducts once in a while, in order to stimulate brand new semen production. Therefore whackering has been invented.
Those species that don't have the whackering instinct, have to suck themselves off (dogs), or wait for a female / male to show up in a ready state, or have a different species whanker him or her off.
You asked when this ability was first introduced to a species. Answer: when the species 1. developed enough brain power to supply the necessary imagination, and 2. the "good life" started for a species, that is, a life when survival was not bound to seasonal or occasional abundance of food supply, but was constant, so females could have the luxury of carrying a pregnancy to full term without much trouble, and let the little baby sucker them and survive without bankrupting the family for needing to buy formula.