New disturbing behavior....help

[Guest guest]

My son has had the urge to " hump " things lately. He started doing this

before going to bed right around the time he regressed--I would find

his favorite stuffed animal between his legs. Now, he keeps trying to

do it to my arm or my leg and this morning he took my hand and put it

on his diaper. I checked for rashes and irritation-nothing there at

all. He seems to be peeing fine--does anyone know what causes

this???? Thanks for any advice....Beth