Associations between drug use and sexual risks among heterosexual men in the Philippines.

The relationship between drug use and sexual risk behaviours among 2272 men in the southern Philippines was assessed. Over 20% of participants used drugs. Logistic regression analyses adjusted for age, marital status, income, occupation and geographic region revealed that compared to non-drug users, men who used drugs had earlier sexual debuts (adjusted odds ratio = 1.73; 95% confidence interval = 1.38-2.17), were more likely to report two or more recent sexual partners (adjusted odds ratio = 2.22; 95% confidence interval = 1.59-3.11), and were more likely to report ever having sex with a female sex worker (adjusted odds ratio = 2.99; 95% confidence interval = 2.25-4.00). Condom use was noted to be low overall among the men in this study; however, the odds of more frequent condom use with a regular partner were greater for men who used drugs compared to non-drug users (adjusted odds ratio = 1.60; 95% confidence interval = 1.26-2.02). There were no significant differences in condom use during last sex or frequency of condom use with a sex worker. While injection drug use was not common (1%), use of oral or inhaled substances was prevalent, and associated with increased sexual risk for acquisition and transmission of STI/HIV. Efforts to decrease STI/HIV transmission should specifically target non-injection drug use as a risk factor.