Eh, that's likely something taken with a dose of salt given that it's likely a sly reference to the phrase '...you know what they say about guys with big feet' when in reality a guy having big feet doesn't actually guarantee a big...rod.
They're also seemingly wenches/escorts of some description so they may simply be teasing him in order to tempt him into purchasing their services.
They're also seemingly wenches/escorts of some description so they may simply be teasing him in order to tempt him into purchasing their services.