RT Journal Article SR Electronic T1 Recreational drug use and sexual risk practice among men who have sex with men in the United Kingdom JF Sexually Transmitted Infections JO Sex Transm Infect FD BMJ Publishing Group Ltd SP 95 OP 97 DO 10.1136/sti.2005.018317 VO 82 IS 2 A1 M Ruf A1 C Lovitt A1 J Imrie YR 2006 UL http://sti.bmj.com/content/82/2/95.1.abstract AB