HMM: Sex in prison is commonplace, the male inmates just hide it more than girls.

Apparently, women lack moral agency:

In fact many females are often in prison because of men. . . . Many female prisoners have been coerced into committing crimes for their partners and when they end up behind bars they find themselves abandoned and they have to survive. And sexism doesn’t stop at the prison walls. Females are still at risk of abuse and rape and unfortunately because they are inmates there is often no legal remedy available for them to seek justice. The word of a prisoner is hardly ever believed. I have sat in on adjudications where to me it was clear that the prison officer is lying but the governor will always rule in their favour. So keeping on the right side of officers is paramount for survival. Many of these women have been abused or have mental health issues and they are vulnerable.

Male prisoners, of course, have none of these problems, and are never in jail because of women.