I'll leave the technicalities to the better informed posters and post some related thoughts. Whenever I watch lions on one of the nature channels, I think a ma

I'll leave the technicalities to the better informed posters and post some related thoughts. Whenever I watch lions on one of the nature channels, I think a male lion looks so majestic and powerful front on but looks as ugly and vulnerable from the back due to its testicles sticking out. When male lions fight, I get this skin crawling fear of lions ending up with torn testicles. Instinctively I cup my own like football players in the wall do. That said, I think on bipedal animals like humans (but not stooped over primates), external testicles are not only relatively safer, they are also aesthetically good. I mean, imagine a penis sticking out of the abdomen without the testicles like a hook nose. Picture the famous Greek naked statues this way and you shall see how odd and ugly it would have been. (One might argue that humans might have been conditioned to consider this rather cropped anatomy aesthetic but that's a debate not worth having.) I often wonder if this external pair of testicles is analogous to a pair of breasts, acting like a natural jewellery that attracts mates. There are several 'feature wish list' I have for humans. Such as. Similar to eyelids, having earlids would have helped against loud noise but I guess noise pollution was not rampant during humonoid 1.0. Same with noselids. I would have loved to have regenerating cartilage, at least, if not regenerating organs (liver is a bit odd but not fully so), but I guess humans didn't live long enough to have lifestyle issues due to joint wear and tear. As for external testicles, if not the way things are, the entire unit, including penis, should have been retractable into a pouch but I guess there weren't pool tables during ver 1.0. This sentence form the article is gold. > We are evolved to survive and reproduce, but not necessarily to be healthy, comfortable, or happy