I'm not too picky when it comes to looks. Your definition of ugly and my definiton probably differ quite a bit. To answer the question, I don't mind if the 'ler is ugly. If he/she is a good friend and is someone I trust, that's all I want. Everyone's gotta have their kicks, somehow. Besides, i'm no brad pitt, either. =P
If it's a 'lee, I would prefer if she looked decent. Nothing against people who aren't attractive but one of the main reasons why I love tickling is to see them laugh. If I make someone laugh who I am not fond of in terms of looks, then what's the point? I would prefer if the 'lee is attractive in my opinion. But like I said before, if the 'ler is a friend and someone I trust, I won't mind if she's not hot. ^_^