system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:Why is masturbation viewed as something you shouldn't do?

Why is masturbation viewed as something bad, that you should hold yourself as much as possible from doing, isn't it a healthy habit?  
Howcome such a normal activity become a thing that gets shamed upon?
gpt
Primitive cultures knew that sex made babies, and that semen was ejaculated into the woman during sex. However they had no idea about sperm; semen was seen either as pure "life force", or to actually be composed of tiny infants. Both of these formed fears about there being a limited supply available to a person, such that "spilling your seed upon the ground" was like pouring your limited reserve of life down the gutter. Consequently they formed taboos about masturbation because they didn't know better.