That's an unusual question which I haven't thought of before...
Let me put it like this:
When I'm with a male which I am attracted to I find that their scent tends to be very quickly associated with sex and masculinity. I also associate male 'musk' with cuddling, sex, working out etc. So it's very likely it's the male pheromones that do this for me.
Women I find smell pretty good too! Though, at no point does the scent make me want to cuddle, get closer to, have sex with, etc.
For me, scent plays a big role in bonding. There's nothing better than laying on a guys chest or another guy laying on your chest and being able to feel, smell, and just really lose yourself in it.
Weird answer, but that's how I feel about it from the top of my head.
Anymore questions? Happy to answer pretty much anything (hence the animosity!).