3. Taoism
Taoism is a religion or philosophical teaching as some would prefer saying, developed in China. It is a religion which propagates simple and spontaneous life. From here we have the yin yang concept spread through the philosophical thought. However, on the matter of sexuality, Taoism dedicated a lot to sex, orgasms and the philosophy behind it. Sex is an inevitable and necessary part of human life, which maintains harmony and health. There were even ancient Taoist books and manuals for sex, very lively illustrated.