What aspects of ballbusting do you NOT like?

I DON'T mean issues with other fetishes being involved in the porn (lots of SPH, foot fetish, chastity, and lots of others, it's a thread here often), I mean things about ballbusting or methods of being busted that you just aren't into.

For me: biting, for whatever reason. Anything that involves IcyHot/toothpaste, etc. Anything that involves burning. I also wish it were easier to do without being so loud. I'm always afraid that somebody can hear the smacking noises.