I know scads of women who swoon over Jeff Warner and Jeff Davis. It's the charisma. They must exude buckets of pheremones.
Karan Casey has a lot of appeal for men I know, and my husband just adores Ellen Cohn. :-)
I'll probably be branded as a weirdo for saying this, but what I find very attractive in a performer is his/her total immersion in the music. When they practically make love to the song...mmmm-mmmm. Physical attributes pale in comparison. So by example, Michael Ducet, when he is dancing with his fiddle, is pretty irresistable.