I don't, mainly because the idea of crossing someone's limits/boundaries - even if and when that's their express desire - terrifies me.
Having had my consent violated by an ex, I'm super aware of how much it sucks to feel like you've been taken advantage of, and I don't want to inflict that on someone else. I would much rather go playful or sensual, even in bondage, because then I feel like I'm doing the tickling with...acceptable intentions?
Like, to me the point of tickling is to Feel Good, and while I do understand that some people are masochists and/or are drawn to Being Uncomfortable, I can't wrap my brain around it, so I find it hard to treat someone in a way that would intentionally be miserable.