Serious, TMI question....Do you all lick your significant other’s balls?

Okay, I’ve been wondering this for awhile....I’ve been with my husband for 4 years. Of course I go down on him and all that, but I’ve never went as far as to lick his balls. Is that an expected thing? Should I have been doing it all along? I’ve asked him, and he just says whatever I’m comfortable with and he has no complaints with how I do things 😂 that’s great and all, and I appreciate that he’s not pressuring and enjoys what I do. BUT should I do more? I’m fine with it if thats what guys like, I’ve just never had anyone ask me to do that in any previous relationships or anything 🤷🏻‍♀️