A study by Emma Fulu funded by a UN programme to tackle gender based violence has delved into the causes of male sexual violence in some countries. Sadly the UK wasnt one of the countries.

http://download.thelancet.com/pdfs/journals/langlo/PIIS2214109X13700743.pdf

Overall the study showed that 58% of thgose who raped started while in their teens. This tells us that the potential to divert and stop rapists exists in childhood and education programmes could target this issue.

What we need now is such a study in the UK and South London.