Rick O'Donnell, GOP candidate for Colorado's Seventh Congressional District, has made as part of his platform Ending Human Smuggling and Modern Slavery. I find it quite curious that he mentions slavery and child pornography only rather than "adult" porn.
I have been unable to find any estimates of the rates of slavery in otherwise legal pornographic trades. If such statistics ever were nailed down, I suspect we'd discover many an American male to be an accomplice in the slave trade. Maybe O'Donnell's silence isn't all that curious, after all.