I don't think this is necessarily an ethical issue since the parameters of the work could be contracted for and boundary issues discussed, made explicit, negotiated and so on. Personally, I wouldn't find it helpful and if anything I would find it restricting and paralysing, but then I am not someone who naturally gravitates towards others for this kind of support. I am also someone who avoids situations where others are present as far as possible so I am probably not the best judge.