It's the thin end of the wedge (ooh err)
Nothing to do with this particular case, but to add:
What consenting adults do to each other, even if not your cup of tea, should not be classed as 'extreme', 'perverted' (or other Daily Fail terms) if they did not cause lasting physical injury. Yes, the participants might walk like John Wayne for a few days, but it was their choice, so leave them be.
The continued push of law-makers against private personal freedoms is something to be carefully scrutinised and resisted whenever possible - which I think most Reg readers do by default.
Frankly, you see more 'extreme' and 'perverted' injuries during sporting events on live TV - won't somebody think of the children! ;-)