I've just become aware of this website:
External Link/Members OnlyOthers may already know of it, but I haven't seen any mention of it on UKP.
Either way, the ability to book a daytime room at a much-reduced rate has obvious merit.
Certainly for punters who want to see "outcall-only" girls and can't bring them to their own homes. Hotels that offer day use must know that many (most?) of their day-guests will be using the rooms for day-sex. So no problem, other than the potential for embarrassment.
And
possibly useful for escorts who do "hotel incalls". But here there arises the issue of how straightforward the access is to corridors and rooms (cards? security doors?) in the hotels that use the site; and of whether foyer and reception areas are discreet and spacious.
(Some British hotels seem to turn a blind eye to escorts hiring a room in order to see a number of clients there. Others don't...)