I would caution against taking offense to this article or automatically dismissing it. In my opinion though, this type of research while probably 75% of the time useful, cannot be used as an indicator as to why someone did or did not do something. As a student of psychology I definitely have a problem with some of the things going on, take criminal profiling for example, you cannot simply look at something about someone (say their sexuality or their sexual habits in this case (the unprotected sex part) and then draw direct correlations to the music they listen to, as if its cause and effect.
With that said though, I mean its sorta hard to totally dismiss because I can think of plenty of examples where this is true, I just wonder how useful the information is in a scientific sense ya know? It doesnt mean every single person who listens to pop and is a guy is a closeted homo

But on the other hand if you take a decent sampling, I am sure that more than half of men who would say that pop music is their preference (not people who simply may be like "oh yeah pop is alright" that they are gay or maybe bisexual or something, the same goes for the heavy metal and the unprotected sex.
The music does not force anyone to do anything, however I find that generally we listen to music that we can relate to or that is about things we enjoy (say maybe "emo" people listening to downer songs or emo music). Well that is pretty much my $.02