[aaaja]

> I mean -- who knows a trivial solution to that?

Segregate by sex first and foremost, and then within each prison estate further separate prisoners by risk categories. It's what's done already for vulnerable inmates: ex-cops, gang informants, pedophiles, etc.

The reason that some penal systems started transferring males to women's prisons wasn't to protect them from other males - this was a justification invented afterwards - but because they decided to implement ideological beliefs that promoted gender identity over sex. Regardless of how much risk this exposes female prisoners to.

Thankfully this sort of policy is starting to be reversed, or has been already, almost everywhere it's been imposed.