A girl who wears Victoria's Secret "Rapture" and "Vanilla.." can get me aroused just like *snap fingers* that! I don't know what it is, but it does it for me.
The next type of scent that does it for me is a bit different. There's something about the smell of a gentlemen's club I used to frequent. It's the combined smell of several dozen high end women's perfume and body lotion in the VIP room. The overall effect of seeing numerous nude girls with the smell is that of "candy", for lack of a better word.
You may think it's gross, but you once you experience it, you will find that it's true. I'll be honest, the smell of a sweaty woman can be a downright ewwww experience. Scientists tell us in their little articles that sweat is a natural attractant. Ok, so they say. I was at a friends house party and it was a warm evening, people dancing getting into the party atmosphere when I got a whiff of this cute girls sweat scent next to me. Ohh my freaking gawd, she smelled so sweet, like a sugar type of sweet smell. I wanted to be next to her and something about her scent started triggering all kinds of wonderful male type things in me! I'm a believer now! And no, we didn't score that night, sadly.
Calving Klein Euphoria. I dated a girl 10 years ago that wore it. Sexiest girl I've ever known and still to this day when I smell it, it awakens an animal instinct reaction in me that I can't control.
The smell outside after a good long rain. Sometimes I open the windows just so I can hear the rain better & turn everything off (tv, stereo, etc.) The sound & smell of nature are just so soothing.