Dr. Kellog history was made fun of in a movie because he seen the sex urge as a disease, same as Dr. John R. Chrisopher seen it. Dr. John was often asked what he did for sex and he said an orange, in that he ate an orange instead. He teached sex only for the production of children which equaled 3x monthly until pregnant. Then 4 years till next time.
Acid system suppose to be a huge cause, the bible would suggest demons are behind it, etc...
In Nature; mammals seem to follow this same theory.................