Blue Velvet
A lot of drugs were being done in Hollywood.
Dennis Hopper probably did about 3/4ths of them.
If you read Chaos by Tom O'Neill, he paints a pretty vivid picture of LA in the late 60s and into the 70s. In the entertainment world, it was just a gigantic, drug-fueled frat party. The whole region. Unbelievable, at least to someone who grew up in East Coast suburbia.
Manson made his money by renting out his girls for beach-house parties, mostly for the younger Hollywood actors and directors. He supplied the drugs and the girls, who would do whatever was wanted. Doris Day's son, Terry Melcher, was in the middle of it; he was lucky to escape with his life, and lived in paranoia for years after, even when Manson was locked up.
LOL! He definitely got more than his share.