If someone doesn't have the 'capacity 'to understand the complicatedhmm concept of consent then they shouldn't be having sex as they are at serious risk of raping someone.
Yes. Exactly. And people who cannot understand consent when drunk should not drink alcohol.
Indeed, men in general should not walk home alone at night. They might rape a woman.
Concerning the thread topic ... why WOULD a woman regret consensual sex afterwards?
There is no reason to "regret" something that was merely boring and at worst could be considered a waste of time so much that one would drag the person one did it with to court.
A man who claims a woman "regretted" sex with him admits that he is so spectacularly shitty in bed that a woman would drag him to court over it. Which is, frankly, not believable, unless "being bad in bed" implies extreme violence that the man thinks was consented to by the act of consenting to sex. Which would then mean that it actually WAS rape.
Interestingly those women who allegedly just "regret" allegedly consensual sex are rarely ever married, in a relationship, nuns or vestal virgins or the like, where it would be plausible that a) the man was not aware of the reasons sex would have negative consequences for them and b) they would have strong reasons to claim that they didn't consent.
They seem to be mostly single women who often have sex with men they don't know that well. (A fact which is then used to victim-blame). Why on earth would such a woman be so upset about sex that was just bad in the way consensual sex can be bad that she wants to sue? That makes no sense at all.