Suck em bitch! A satisfied woman wants to satisfy. This is a better option especially if she's a lady who would be offended by her loving boyfriend telling her to lick his sack. Have you tried just asking her nicely? I really think that's something most girls would be willing to do. If you've already asked and she's said no, then say no the next time she wants you to try something new.
My girlfriend loves to suck my balls in front of a camera
My GF Suck my Balls - vademecummag.com
It hurts enough to override any pleasure, and I have to tell my partner to stop. Is this normal? Does ball sucking hurt for everyone? Is there something I can do to make it less painful? So the better it feels to have your balls sucked, the more turned on you get.