Ellis was a British sexologist who gets credit for being one of the first to write about homosexuality without talking like it was a disease or a criminal act (in fact, he wrote the very first medical text on the subject). This was way back in 1897, putting him so far ahead of his time that most of the world still hasn't caught up. Seems OK so far ...
So what's the problem?
He never had sex. Or at least, not while he was writing on the subject. He was a virgin until age 32, when he got married. To a lesbian.
After the honeymoon, he returned to his bachelor pad and she stayed at her place, presumably busying herself with the whole being gay thing, while he practiced tirelessly at remaining a virgin. One of the things that might have made him so good at his craft: he was well known to be impotent.
So he lived his adult life as a sex-free sexologist and it was only in his '60s that he discovered the magical cure for his impotence: piss. The details aren't entirely clear, but at some point around 1919, he happened to watch a woman going to the bathroom which caused sleepy little Havelock to finally wake up, giving him his first erection at an age when most men are experiencing their last.
"I'm sorry, I didn't realize this was the ladies' room. Please, just continue what you were doing. Please."
We guess you could make the case that his sexless life allowed him to remain objective on the topic, so that he could, for instance, write a detailed description of the male erection without the usual interjection of "HAVING A BONER ROCKS!!!" that plagues the works of other males in th field. Still, it's hard to take cooking advice from a man who has never eaten.
Ironically, he was also a supporter of eugenics. So basically he believed that most of the world's problems could be solved through selective breeding and golden showers.