I don't think that the study can necessarily be generalized to the greater population. Amsterdam has a high rate of IV drug use. Even with liberalization of drug laws and needle exchanges, the rate of IV drugs is a potentially strong manner of transmission for HIV. I'm not convinced the researchers corrected for this in a manner that would make the study applicable to other populations.
Still, the findings are important. Obviously safe sex is important even for those in a committed relationship, and this is possibly more true for the young male studied in this survey than their older peers assuming that promiscuous behavior diminishes with age (not necessarily an assumption I would readily make, but it seems to have face validity).
The other important finding is very relevant for those working in public health. Increasing the availability of both HIV testing and HAART drugs has a very strong and significant negative relationship with the spread of the disease. This is a way more important finding that anything that this study says about the sexual behavior of homosexuals in committed relationships or homosexual men in general. Really, what we should take away from this study is that public officials should be strongly encouraged to subsidize and increase the availability of HIV testing and HAART drugs as a means to stem the spread of HIV. Of course, such public programs are no doubt more expensive than simply encouraging those in committed relationships to continue to practice safe sex, but it does sound like we should approach the issue form both angles.
