The other thread wasn't absurd because it's possible for people to be more attracted to others based on whether or not they're ticklish, how ticklish they are, etc., whereas people can be ticklish no matter what they look like.
The only thing I can think of that would fit this thread, is that apparently its been scientifically proven, that both male and female who are a couple, are more comfortable with each other, and thus are more ticklish with each other, because I guess they let each their defenses down more around each other or something.
Like I said before, whether or not someone is beautiful or ugly varies from person to person, but whatever you personally see as beauty or ugly, the beauty will ultimately make you more comfortable to tickle or be tickled (though I doubt you'd do anything tickling related with someone you found completely unattractive), and if the feeling is reciprocated, then it could mean more ticklish times.