Mmm, a lot of the problems with shame over anything remotely sexual, even between husband and wife and even if you’re talking about sexuality from a medical or biological standpoint, comes to us from the ethics of the middle class in Victorian England. The thing was, the middle class was trying to get some level of credibility in society (the upper class were pretty much “anything goes” since they had the money or clout to silence any objectors, and the lower class were so marginalized, they may as well have been invisible), thus, the only thing they had to go by was to follow a morally rigorous code of ethics, up to and including such absurdities as hiding the legs of chairs or tables or pianos under cloth covers so that young men wouldn’t think about a young lady’s legs. The word “leg” was practically taboo, hence why a chicken leg is called a “drumstick” even to this day. Using the word “bull”, even when you meant a male cow, was considered unacceptable as well; the word “ox” was used, even though an ox is a castrated male cow trained for pulling heavy wagons.