On the note of locations, it's interesting to know that on the Wednesday suspense drama (which is made for TV detective crime stories broadcast at 9pm) the so-called criminals more often than not start out as 'normal' people who are forced through circumstances into a criminal act. And part of the process of the detective uncovering the reasons behind their crime is to retrace their footsteps. There is usually a scene where the detective finds himself in a location, normally a public location, asking himself what they were doing there and why they were there. And quite often the answer is provided by a local who informs the detective what the location is used for locally - the purpose can range from romance to social events, like a little known festival, or it could be a place where cyclists get together, etc.
My point is that once a 'use' has been established for a space, most Japanese will confine their use of it to this blueprint. It may not be obvious to an outsider what this use is, but that's how these dramas work. By uncovering the unwritten 'blueprints' which dictate how a location is used, the detectives then know the motives of the people who frequented those spaces, ergo, they can piece together the motives for their actions.
It's important to clarify here that the distinctions can be VERY subtle - someone's presence on a part of yellow flag biker route can indicate they were a biker.
On one level you could talk about the love hotel being one extreme and someone's house being the other, and the question being 'what lies in between?'. But it's best to remember that Japanese spaces are 'themed' and extremely varied, but amongst all the variations that I know exist and beyond these (to the ones I don't know of) I can't imagine there being a space with a 'theme' of the kind of intimacy that you're looking for. Perhaps that's one reason that so many Japanese women go abroad (because many have fantasies of chatting and cuddling on a sofa and eating ice cream too).
Doesn't mean that the intimacy can't exist in Japan, but it's up to people to bring their own idea of intimacy to these places - except that a Japanese person will theme it to the 'theme' of the location, in other words, they'll let the location inspire them. So standing in a queue in Disneyland offers an opportunity for intimate conversation without the stark intention of a conversation that a phonecall might have, in keeping with the innocence of Disneyland.