First thing’s first. Let us be grateful that there is no such word in the English language as “licked sucked.” If there were, dogs would suck their owners hands all day and blowjobs would become quite tedious for everyone involved. The point is, licking and sucking are two very distinct activities, and that is never more apparent than when dealing with a man’s nuts.
So, do men like sexual attention paid to their balls and scrotum? Yes. Attention by way of a woman’s mouth? Yes. Would 99% of men enjoy some licking of the balls? Yes. Sucking on the balls however takes a true skill on the woman’s part and some getting used to by the fella. Add to the mix that some men’s balls are just too sensitive for nut sucking of any kind and you have yourself a very one to one situation on your hands. I don’t often mention turning to porn to learn anything useful, but in the case of ball sucking I think I will make an exception. There are some good ball suckers out there, namely because they’ve had ample practice. A novice going into suck a nut can likely suction too hard and cause real pain and mental trauma. Like with most sexual things it’s best to start real s-l-o-w and see what’s what. Though your mouth will be filled with balls, his, in all likeliness, will not and thus he can communicate verbally if something feels good, great or way too rough. I applaud your interest in giving your man a well rounded sexual experience. As the great Teddy Roosevelt once said, “speak softly and sucks nuts most gingerly.”