No matter what anyone says, all guys like to go down on girls.

But here are a few pointers...
1) I'm sure you taste fine, now all you gotta worry about is showing him your "O face"
2) It's a real turn on when guys/girls know that their partner is getting off, so make sure you let him/her know that you are enjoying what they are doing
3) Relax, have fun...open wide, cuz its time to dine at your Pink Taco Stand hehe