I think it's easy to forget that sex is a basic, instinctual need.
I'm not sure if I'll get this right because I learned in sociology a couple decades ago, but humans in general need the following, in order --
- food & water
- relationships, including sex
Then, you get to work on all the extras, like accomplishing goals, building your skills, etc.
These are young men, with all the hormones going that tell them it's time to reproduce, and psychosis often looks to me like the primitive brain is taking over. They're stuck in fight or flight mode & just trying to survive.
Add in that they're lonely, they may not have good social skills, and they're desperate for love & acceptance and it's no surprise that these kinds of things happen.
I think it's a subject that's very hard to talk about in a group of parents - I bet it's probably one of the biggest symptoms that's just not mentioned.
And, to be fair, lots of women with severe mental illnesses make bad sexual choices too - I'm sure they get taken advantage of & worse. The difference is that it's just easier, in most cases, for women to find someone to act out with than it would be for a man with a mental illness.