Scent is hugely important to me in physically intimate relationships. One of current lovers is just delicious...I could lick and inhale him all day.
It's funny, I met someone not too long ago who I'd probably usually find attractive...but his scent was repellent to me. Not sweat or uncleanliness, just sort of an odd metallic scent. I couldn't even be around him very much before it really began to bother me.