This is food play and is extremely common. Doesn't do anything for me, but I've seen it in mainstream Hollywood movies. Should you stay in the business I'm sure you will hear many stranger request than this. However as your services appear quite limited to 'attractive punters' only I fear you won't.
For the last time, I didn't say I only want to see attractive guys; but I do reserve the right to decline people that completely put me off. In fact, today I've seen a guy for the second time and he's very fat, extremely hairy and quite smelly as well. He was very nice to me though hence the reason I saw him; twice.
And back to the topic; I agree, I'm sure I will come across much stranger requests... There was once this guy that I knew though (not a punter)
that kept pestering me about buying my clipped toenails (?!)