Henry Lee Lucas said it was the reason he started his killing spree. In his own word's he said lack of sex was always his biggest downfall and if it took killing to get it that was what it would take. Shocking i bet to you?
1) Where did he claim this? Do you have a source?
2) He claimed his mother was his first murder. Is there a sexual element to that? I don't believe I read anywhere that incest was ever a factor in the family but that he claimed to have been forced to watch his mother having sex with other men. Source: Henry Lee Lucas - Wikipedia, the free encyclopedia
3) Lucas also claimed to have been a part of a satanic cannibalistic cult, killed Jimmy Hoffa, delivered poison to Jim Jones, and confessed dozens, then hundreds, then over 3000 murders. He has made many claims over the course of his life within incarceration. Source:
Henry Lee Lucas - Wikipedia, the free encyclopedia
I believe Henry Lee Lucas was a deeply disturbed individual that desperately needed medical intervention for his mental state.