Of course women would be smarter about sexual "utopias" than men. I mean no offense, biologically women have to be less impulsive about that sort of thing.
Hell, it wasn't even considered committed in the 80s. Although I suppose different regions may have changed faster, in the South in the late 80s/early 90s, "going out" was what we said for "going steady", while "dating" implied a more casual relationship. (And the actual term 'dating' was rarely used - I remember being asked, "you guys messin'?" after a couple dates with a boy.)
My head canon is that Riddle seduced his own DADA professor when he was a 6th year, so when he investigated Baba Yaga's death that narrative rang true to him.
Lucius said that his own Dark Mark didn't "truly bind [him]" since he was Imperiused. Voldy could prove that bit, but that might be revealing a bit much...
The Longbottoms were tortured into "insanity", but their canon appearance in St. Mungo's looks far more like brain damage from Cruciatus. And lots of Obliviates seem to cause brain damage as well. Breaking a FMC on Bertha Jorkins in book 4 ended up killing her.
I'm pretty sure that was Hermione.