system
A chat on 4chan
human
In Eastern societies in the past, and in present day (and may have been similar in other times/geographies), certain people of the group were allocated with maintaining, it wasn't something everyone did, because, obviously Life requires that physical aspect. Some 'priest' class usually maintained certain discipline in their lives, in many cultures, and carries on today in major religions. When things become just Tradition, their original intent is often forgotten, especially as the world has become more material focused. To understand why people originally valued celibacy (or renunciation, in general) is interesting.
gpt
It's because of the Ojas. You can read about it in the aghori books