For men restricting..? Oxygen? So prevention of breathing when about to orgasm. Has been practiced for ages. Auto erotic asphyxiation being well known due to occasional deaths of men in the public eye. Really tragic.
Until it started in porn I am pretty certain that it was not a known thing for women. I mean people like all sorts. So not saying never. But. Not a widely known thing like for men.
Strangulation meanwhile has always been a common way men killed women.
Given those things.
This sudden increase in women dying from strangulation during sex. I'd bet that's increased a lot over the last decade or so.
Given men most definitely have always enjoyed restricting breathing to enhance orgasm. In numbers large enough to mean it's pretty well known.
Where are all the men dying during sex? Why is it invariably the women who (apparently) like this. And not the men asking women to do it?
I mean common sense says not what it's presented as.