The headline is a bit misleading. Older guys still have a low STD risk rate-it is is just growing relative to other populations.
I haven't checked out this journal reference yet. What I remember from elsewhere:
there are serious claims that viagra etc. may have a slight increase in per coital risk of STD transmission when other factors are held constant.
This is a rather tricky area of research in part because of the drug interactions are complicated.
Also, this study didn't compare per coital risk of viagra users vs. non-users. It is entirely plausible to me that viagra users simply have more sex.
The question in part becomes:
what kind of STD prevention techniques are appropriate for older folks?
I personally think it is _nutty_ to promote old fashioned male condoms in that population. If guys are having troubles with erections, that male condom isn't going to help that problem at all.
My own favorites for STD/STI reduction in this population include:
a) promotion of use of female condoms(which really can make a huge
difference for guys with an erectile problem)
b) more frequent testing among older men and their partners
c) increased education(i.e. training folks to spot risk factors and STD