I strongly believe that whatever consenting adults do in private whether BDSM/S&M, polyamory, sex work, whatever is nobody else's business but theirs.
However
There is a very significant problem regarding the appropriation of minority rights groups, including lesbian and gay groups, "kink positive", "sex positive", polyamory and sex work campaigning groups by cults, criminals and social engineers.
This is an entirely different issue to the issue of whether, for example, all sex work is rape (I do not believe it is), whether it is OK to be in a polyamorous relationship etc.
Unfortunately the pendulum swings between oppressing minority groups at one end to promoting the most extreme and ridiculous narratives at the other.
The result is confusion and a feeling that the world has gone completely mad, with people who should be listening to one another and learning from each other up in arms with each other.
I experienced this in a very personal way when I gave some interviews to the media about being trafficked many years ago.
Lots of different campaigning groups wanted to appropriate my narrative to serve their campaigns, everything from feminist separatists who seemed only interested in portraying me as a victim and survivor of abuse by the patriarchy (while I might be a victim and survivor I am not defined only as such, also I have been abused by women many times), through to racists wanting to appropriate my narrative to serve their own campaigns of hatred.
Re S&M/BDSM/kink I think that this is a centrally important issue but it is an issue about which it seems very difficult to discuss to think about. The pendulum swings between the extremes of “all BDSM/S&M/kink is abuse against women” through to "BDSM/S&M/kink is wonderful and empowering and can be used as psychotherapy to heal people from the trauma associated with child abuse” at the other.
The book 50 Shades of Grey, which I have not read, seems to me to be part and parcel of a promotion of "kink" to the masses. I have met many women who are experimenting with kinky sex having seen the film or read the book.
The fact is that lots of people, men and women, experiment with all kinds of things sexually, and, providing it is consenting adults, I do not have any problem with with people experimenting sexually. I do have a problem with “kink” being promoted as psychotherapy. I also have a problem with the various “kink positive” counsellors and psychotherapists touting their business as many of them have links to abusive cults.
Before Christmas we hiked up a mountain in New Zealand: deserted area, busy at ski time but not in the summer. When we got close to the top in an area where the skiers park we found a car and a short distance away could see a naked woman tied and dangling from a tree branch while a couple of fully clothed men were photographing and doing goodness knows what to her.
My concern re this would be a) to ensure that the woman really had consented and was not being assaulted b) the fact that this was sexual activity in a public place where children might stumble across it.
If the woman really had given consent and really was having the time of her life, and the spot was deserted 99.9% of the time so accidentally being stumbled upon by children was not an issue, what would you think then? Would you still want to rescue her? Genuine question asked out of curiosity, not having a go at you.