Alt: if he came round and was staying over then yes.
If he'd just come round for dinner, say, and then expected to bathe as part of the deal, I'd be a little suspicious. I think I'd suspect that he must have shat himself or something - why else would he be asking to have a bath?

'HAVE YOU SHAT YOUSELF OR FACKIN' WOT, SUNSHINE?' I would ask.
( Monty Boyce, My cheese game is strong, Tue 31 May 2011, 9:04, Reply)