S.H.
My daughter, in her pajamas... has to line up the center seam of her pajama bottoms... with her belly-button.
It is just her and she has always done that since she was a Toddler. She is now 8.
She is not OCD or anything. Just... quirky.
My son, likes to rub my arm-pits and tells me not to shave.
He likes the "pokey" feel. He also likes my Husband's facial beard when it is stubbly. He rubs my Husband's face too.
all the best,
Susan