It's a known estimate in the public health community, that has been reported by the Centers for Disease Control and Prevention, which conducts on-going research in the area of HIV/AIDS, and more recently, the "down low".

>>it's an obvious trash statistic, if it is a "down low"
>behavior then what kind of methods are used to come up with
>that statistic, seems awfully inflated to the extent that
>every mofo walkin down the street is a homo, insane. As much
>as you can inflate it to 80% it can be deflated to 5% or
>something, it's a matter of paranoia v. understatement. who
>can really say?