Jim, Straw said they did it because girls from their own community were off limits to them.
They are off limits because the culture is restrictive of them. That is a cultural explanation of the behaviour.

I thought it carried more weight coming from actual BPs and Muslims so I did not need Straw.
I did use Straw's testimony as evidence that there is an issue to be explained.
His work as an MP gave him experience of it in his constituency.
That is why I referred to him so many times, and because you keep pretending not to believe it (except when you are tired and go off message).