Love Hotels run the gamut. However, they do cater to a certain clientele with a certain purpose. Drive-up windows are provided, with opaque windows. They don't see you, you don't see them. A space sufficient for sliding credit cards is at the bottom of the windows.
Rooms have separate entrances, and it is possible to enter and exit without being seen by anyone.
But the purpose is not only affairs, young couples also take advantage of these. In crowded city areas, where living space is little, and privacy almost none, college age couples choose to spend their money on both. Rented hourly, love hotels are surprisingly inexpensive. Poshly luxurious rooms are also available. A sure sign is neon, and lots of it.