Love hotels are the culmination of crazy Japanese pop culture. You can enjoy rooms with outrageous themes, Karaoke system, jet-bath and movies on big TV screens. When in Japan, do as the Japanese do — and be sure to take selfies!
You can use Loveinn Japan to find love hotels and reserve a room that meets your needs.
At the moment you can only reserve overnight stays, but at a later stage you will be able to reserve rooms for short stays as well (2-3 hours).
Please keep in mind that not every love hotel can be reserved!