I don't genuinely believe any man in court over a woman's murder who uses the "sex game gone wrong" defence is remotely telling the truth.
In BDSM relationships it's always meant to be the sub that's in control not the dom so it's not even remotely conflicting.
This statement is a dangerous rookie error perpetuated by Fifty Shades of Grey. Actually the dom and sub (or top and bottom or whoever else is taking whatever role they have established) are both in control to equal amounts. Both parties have to consent and both parties can withdraw that consent at any time. Not just the submissive.
This is KEY because it means that if it goes wrong and someone dies, even if he says she consented, it's indefensible. The dominant or top should have withdrawn their consent to do the act when they saw that they were out of their depth. They don't blindly kill someone. It is really dangerous to pretend a dominant is powerless but to do what the submissive asked of them, and it is utter bollocks. A skilled and experienced top will safeword if they need to stop things, which is why you never see genuine BDSM-ers in court on murder charges.
The only people who end up in court claiming "we were doing BDSM" are untrained idiots doing something they don't understand and pathological liars trying to get away with murder.
If it was genuinely BDSM-ers doing these things, you'd see women dominants in court claiming "sex game gone wrong" from breathplay or choking fetishes with male or female submissives, and gay men claiming it too, and you never do because actual dominants know what they are doing before they do it and call it off if they need to and always have that bit of awareness (the part of you that watches yourself) keeping track of the welfare of the other person.
It's just misogynists trying to lie to save themselves and they care so little about the woman they have killed that they would rather her grieving family think she liked a type of sex that's very stigmatised rather than take their punishment for murder.
Also it's really fucking easy to establish if people had an interest in a niche subculture or not by doing a quick check of their house and electronic devices.
The rough sex defence should never ever have been allowed and removing it won't affect responsible and properly-trained BDSM practitioners following SSC in the slightest so people coming on and going "but I like rough sex, this law will harm me" need protecting from themselves because they are clearly not trained and shouldn't be engaging in the things they are doing.