I love it! I am extremely ticklish, and it produces a strong reaction, and extended tickling becomes negative (I have a bad memory of my sister making me pee when she wouldn't stop, we were little). But I always want the person to start again! It's such a thoughtless way to bond and get endorphins, not really difficult or tactful at all. I can even tickle myself (though it isn't the same).
I also really enjoy small tickling sensations. Not like a hair in my shirt, but I LOVE my snake's tongue flicking over me. Or duckling fuzz, or letting a scorpion crawl on my leg.