@Anonymous I was expecting this ^from you! - I would agree with you that guests can do what they like in an "entire place" listing, provided they cause no damage nor nuisance to neighbours. But I disagree that, because guests are paying, they can also do what they like in home share situations. I would have thought that in HOME SHARES, all guests have a duty to be RESPECTFUL of the host, CONSIDERATE GUESTS. Noisy sex is disrespectful i.m.o. If I was booking a place to do a John & Yoko, & stay in bed ALL WEEK (!), I would choose, somewhere completely private, or a hotel. NOT under the nose of a landlady!
Re the cultural exchange bit, I always understood that was part of the uniqueness of Airbnb?... 'Live like a local!' - A host near me told me he hosted for these reasons, not the money, & had a bit in his listing description suggesting this was important to him... for this reason he favoured travelers, not business people. (He no longer hosts, I suspect the pulling of the profile pics & other tools to select interesting guests.) A lady round the corner hosts in her (nice) garden shed for £15 a night or £24 for two, home made bread included! She is not doing it for the money, she wants her little boys exposed to interesting people, to broaden their career aspirations, so she said!