Man that is a bummer on your friends part. It is not really a black or white thing, because every black women I have been with didn't have issues with sucking a dick, it is the sentiment of you friends statement which is "I won't do nasty sh**" which when I am with a white women isn't a issue, whether it is normal sex, anal, stretching etc... We never viewed sexual expression as nasty , were as some of the women of color were to reserved or afraid to get out of the norm, they would get uncomfortable with the slightest anal rimming or anal play even though there body enjoyed itOne thing my friend told me : she said " us black women won't do nasty sh** like suck dick".