[Jimmy Valentine]

Agreed. But still he had money, renown and power. I don’t understand his motivation.

[MarMema]

He preferred unresponsive women. Maybe he was inadequate to excite women or he didn't want to include that in his sexual act. Most likely it was the very act of drugging them and seeing them unable to respond that got him excited.

Just like some men really like lingerie and others like being in an elevator.

In the series Mindhunter, based on the John Douglas book of the same name, the lead character is presented with his girlfriend in black lacy underwear and heels. And he doesn't like it. It completely stops the mood for him.

If something abnormal or against the law is what gets you going, you may end up in jail.

Freud said our sexual desires and especially fetishes are formed very early in life, something like age 9 I think.

That's why it is important to shelter children until they are past that window of time.