Sexual inclinations of down syndromers and other LD groups?

As we are in a liberal tolerant society with people from all kinds of backgrounds able to have sex without fear of persecution, is it not time we extended this courtesy to the mentally and physically handicapped likewise? FTR, do people with Downs have much of a sex drive, and is there any real reason why they shouldn't engage in relations with those of a similar disposition? Is the prospect of them doing so any less shocking than the vast numbers of mixed race sink estate teens copulation/breeding this country in to oblivion?

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