your Butt
This is kind of a fun subject, although, for me it's more as a tickler.
As with the rest of her body, my wife is deathly ticklish there. As a lifetime appreciater of the female art form, there are some things about this kind of tickling that are simply irresistible.
It's one of the "no fairs" in this house. Needless to say, I can't resist doing tickle things to a wife when her defense is to scream that it isn't fair. I think it might also border on fetish for her. I'm ABSOLUTELY never allowed to tickle her there except when we are LOCKED in our bedroom. That rule is sort of fun for me, although I break it only rarely.
It's a great tease as I always tell her her butt is presenting too inviting a target. This sets her off way before the tickling starts. The way she tries to protect herself is to cover it with both hands. First, she can't reach down far enough that way. Second, she gets zero leverage when I am sitting on her thighs. Since she has zero leverage, I just take her by one wrist and lift her hand and tickle right where it was.
There is a fixation in the tickle community about getting your hands inside your victim's clothing. Usually we refer to shirts and blouses and such. For me it's digging up into my wife's panties while she is going crazy.
Lastly, this is one of those deals in tickling when there isn't any other way to say it. If your wife or girl friend is a little more if the full figured variety, tickling her butt is...well, heavenly. I've administered it both ways (slender and curvey), and I know!
I get her ribs and armpits much more often, but as I think about this, I now know what will be my target for tonight.
Hiram.