My guess is that when a guy smells perfume he is likely to associate that with a woman. It's a similar phenomenon when a guy looks at a picture of boobies and his testosterone raises. In other words, anything that a man can associate with a woman MIGHT trigger the sexual stimulation part of the brain. Of course it can't be with anything, for instance I doubt a man would get aroused by the sight of a tampon. So let me reiterate what I was saying: It is likely that anything a man can associate with sexy time (perfume, boobies, ect..) might elicit a testosterone response.
The idea that something in the perfume is having a physiological effect on a guys testosterone level is retarded. I think all the study found was a positive correlation, which means nothing.
So many of the articles that they post around here are so easy to debunk just using a little thinking and common sense.