Well, for someone you're not attracted to it wouldn't be, it would come off as stink, but for someone who you're attracted to you would pick up the pheromones, and likely your nose would associate it with something pleasant. But adrenaline doesn't generally smell bad, adrenaline mixed with arousal... well you couldn't find a better aphrodisiac. That's even picked up by someone who doesn't pick up on sent as much as I do.