I am not so sure. Where I take my two girls to school, working class people are generally more conservative on moral questions than middle class people. It came out over sex education (which given my daughter is eight, I thought was a bit quick off the mark, but there you go). The big row was over the use of the word 'clitoris' in the lessons. All the working class parents (mothers, mostly) were solidly against, as were afro-caribbean, Turkish and other muslims. All the middle class parents were adamant that this must be taught.
Looking at the row, It seemed to me that the working class parents' moral conservatism came about because they were struggling harder to keep their families together. Family, and social disintegration were more immediate prospects to them. They valued modesty, as a moral value, because they felt it was a weapon in their fight to retain order. In a word, they did not want to hear their sons shouting the word 'clitoris' around the playground.
"in the black community, research has shown that they are willing to support civil rights elsewise, just _not_ marriage. as is pointed out in the article below, the reasons are complicated, but I suspect the reason why black heterosexism is higher than typical levels of heterosexism among whites and latinos has to do with desire for cultural assimilation: being heteronormative with a vengeance, in other words, to *prove* to whites that you're just like them. As the VV author says, black folks have unfortunately become *more* bigoted than whites on some issues. (Which is why I have said that my observance of issues at work is a _class_ issue: both the hatred of poor people and the hatred of homos.)"