at my old school ... the PE teacher's favourite punishment for 'slackers' at sports was the make them do a naked lap of the rugger field 'no shirts no shorts! ' I can still hear the detestable man's voice ! Ah the good old days !

Or are we talking naked lap dancing ?

Or even do you mean 'do a naked Lapp ' ( ie an inhabitant od Lappland ) /

or do you mean lap ( ie lick ) someone whilst naked ?

Maybe he meant a naked lap around the house....

Could you clarify what you mean by a naked lap? Do you mean run a lap around a track in the nude? Or sit one someone's lap when he or she was nude? Or sit on someone's lap when you were nude? Or have someone sit on your lap when you were nude? Or have someone sit on your lap when he or she was nude? Or when you both were nude?

I've done all of the above.