i really enjoyed speaking of this with you guys

if i had evidences, other people would have already made books with them

well, now, back home. maybe a bath, and a huge dish of spaguettis
heres the base of my reflection :
every culture/society starts with religious beliefs (you name it).
at the very core, a religion serves to give a hygiene of life. its the real base of the health care.
whatever you say, sex is one of the fastest way to propagate illnesses. to avoid thoses propagations, choose one wife/husband, and stay with.
a society is not eternal.
and when the society grows and takes age, people feel the end coming. its the collective inconscious. they live their life and have fun and all without thinking to tomorrow. carpe diem uh... they do that because there wont be a large amount of tomorrows.
one of the most fun is sex.
about all of the sexual deviations, of course, they happen at every era, every cultures, but they are not most of the population. and when they are most or all the population, the end is very near.
bonne nuit, buenas noches, good night people