1. Methamphetamine and sildenafil (Viagra) use are linked to unprotected receptive and insertive anal sex, respectively, in a sample of men who have sex with men. Issue 2 (30th March 2006) Authors: Mansergh, G; Shouse, R L; Marks, G; Guzman, R; Rader, M; Buchbinder, S; Colfax, G N Journal: Sexually transmitted infections Issue: Volume 82:Issue 2(2006) Page Start: 131 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗