Normal for us, with some understanding. My wife tickles the crap out of me during foreplay and sex, especially if she wants to make me finish sooner. She also likes to tickle my feet when I turn around to lick her lower half.
She does not like to be tickled at all, but will tolerate it for me. I make sure not to abuse the privilege and she makes sure to let me have my way completely fairly often. I like to make her cum as much as she wants, then have her let me tickle her feet while she licks me or we have sex. Of course since she's already finished it's even worse for her than normal, and she really groans when I tell her to stop so I don't finish too quickly--that means more tickling on her. She has a good way of putting her feet on my hands, or my hands on her feet (depending on what position we are in) to let me know I can go to town.