Gain acceptance? I don't know about prisons in England, but I do know a bit about the people who go to prison here, and they are not 'nice' girls. And even if the person could hold their own one on one, prison is not like that and its hard to take on five, ten, twelve people. Though I imagine this murder/rapist would get raped a lot in a mens prison, I can pretty much guarantee you that the women are going to rape them with every object they can find, in every place they can stick it. Every day. Every night.