Rare in the general population, anal cancer has reached epidemic proportions among HIV-infected men who have sex with men (MSM). These cancers are human papillomavirus (HPV)-associated, usually HPV type16, and are analogous to cervical cancer. At present, the rates of anal cancer in this group are 10-fold higher than that of cervical cancer occurring in women in the general population.
Dollars to donuts, no one suggests that gay men:
1) stop having anal sex or
2) stop having numerous "concurrent partnerships".
Because, you know, that would be too obvious. You can't expect sexual restraint from gays, can you?