Bodily mortification and sensual deprivation were two methods ascetic tried to reach higher level of consciousness. Many have tested this in multiple religion. The concept of celabacy was created with an intent to raise that Kundalini energy to 6th and 7th Chakkara as it is believed that creates high level of DMT. When Rajaneesh asked his Western devotees to saturate sensual pleasure, I thought his teaching was to raise sensual desires to a frustrating level so that such desires would disappear. One of the research paper I studied recently indicated that highest level of orgasm during an attempt to procreate also results in high level of DMT. Don't ask me why only when an attempt is made to start a family. I don't know the answer. May be thousands of years back, procreation was the only purpose men and women got together.