Meth Users More Likely to Contract HIV

(from the article:)
So how does meth affect the spread of disease? The answer is simple: Sex.

"Because crystal meth can increase sexual arousal while reducing inhibition and judgment," the study read, "Its use is associated with high-risk behaviors that increase the likelihood of acquiring a new STD or HIV."

In other words, users tend to have risky sex, both in terms of the who and the how. In rats, Bolan said, amphetamines cause obsessive and prolonged sexual behaviors - it appears like it does the same thing to humans.

"The effects of a given dose of [meth] last for hours and this can result in so-called sex marathons where an individual can engage in continuous or repetitive sexual activities with the same or multiple individuals," Bolan said, adding that the drug also tends to dry out mucous membranes, like the rectum, adding potential to injury. "All of these things - prolonged intercourse, multiple partners, dried mucous membranes - promote transmission of HIV and STIs... One effect of [meth] is that it can inhibit erections, but with erectile dysfunction drugs that side effect is no longer a limiting factor."
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is this why people smoke meth?
does it act like viagra?