The question I asked earlier and no-one who says it's just "prankish" has been able to answer is that if there is no sexual context why was a sexual organ used and the same for teabagging etc. That body part was used for a reason - not for gratification - but as a symbolic representation of the undertones.
Guy pulls his mates hat off and sticks it down the front of his pants....now his mate knows where its been and possibly has the smell of this guys testicles....sexual organs used but not in a sexual way.
Personally im on the fence with this one but swaying towards the it should be classed as sexual assault.