Question from mod forum: homosexuality + retardation

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So I was reading a post where a mod got called a gay retard which got me thinking about whether or not people who actually mentally retarded express things like homosexuality, or whether or not there have been any studies. I think this would be interesting as its not something I've ever seen discussed but I would expect that ratio of homosexual to heterosexual to be the same regardless of IQ. Would everyone agree?

I did a google search but found absolutely nothing.