Yea I would say it's a great thing if it's down gentily. I would say do not pull at all. I love it when I'm getting head and she rubs the skin behind the balls (it takes a while for me to start feelin it but when I do it's good) I think that's supposed to be the "G spot" on men, but I could be completly wrong. now you want to rub the balls as your doing this. How do you want to rub them you ask. You know when you click you nails on a table first pinky then ring then middle and then index falls, use the movement of rubbing (don't click on the balls though) But that shit feels unbelievably great, I would say without that head is not the same.
"Orgasums hand'em up, Ya'll just don't give a F**K!" (Ludacris)