Cite
MLA Citation
G Mansergh et al.. “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.” Sexually transmitted infections, vol. 82, no. 2, 2006, pp. 131–134. http://access.bl.uk/ark:/81055/vdc_100135159636.0x00000f