Only trouble with that is apart from the fact it would no doubt require further testing (which we don't want) is how is he supposed to let the girl know when said job is done besides if he has been instucted to wash the car and he doesn't I am sure any girl who has a DL2000 fitted to her male can think of a way to deal with it.
RFID has been shown to induce cancer in persons carrying debit/credit cards with embedded RFID chips, close to their body (e.g. in a wallet). As a result, most banks that Incorporated this technology into their cards have reissued them without it.