Human Papillomavirus Infection and Related Anal Lesions in HIV-positive Men Who Have Sex With Men

Intervention (procedure): * Patient medical interview (initial inclusion visit, Month 12 and Month 24 follow-up visits and if applicable Month 6 and Month 18 control visits) * Standard proctologic examination with digital rectal examination and 2 anal swabs (initial inclusion visit, Month 12 and Month 24 follow-up visits and if applicable Month 6 and Month 18 control visits) * High resolution anoscopy (initial inclusion visit, Month 12 and Month 24 follow-up visits and if applicable Month 6 and Month 18 control visits) Only if lesion suggestive of Anal Intraepithelial Neoplasia (AIN) detected during High Resolution Anoscopy (HRA): \- anal biopsy(ies) during HRA Only if high-grade lesion (Atypical squamous cells-cannot exclude high-grade squamous intraepithelial lesion (ASC-H), High grade Superficial Intra-epithelial Lesion (HSIL) or AIN2/3): \- HRA biannually