So it's being stropped by a deaf person, or maybe a well trained deaf animal (one of the ape family, possibly), or Jimbo's stropping robot that was talked about before...?
[EDIT] unless of course we take the premise that an animal is not 'a body'. And what do be mean by the word 'nobody'? Does the term 'body' always infer a human? Or can it be any entity? Could it be an alien, an alien kind without the sense of hearing? And why would the aliens be stropping for us? Have we enslaved them? Is it a mutual benefit thing? Are we their pets and they strop to excite us; like giving a dog a treat? Hmmm?