>>510580250
>>Men who have sex with men
It's a special classification because of undercover faggots. The MSM qualifier was created because hetrosexual women were getting hiv from their seemingly hetrosexual boyfriend/husband. This was causing data spikes so they looked into it only to find out that in nearly all the cases the women got HIV from her husband after he got fucked in the ass by a man. To have accurate data, they created the MSM quantifier.
