Pascal’s mugging against an actual opponent is easy. If they are able to carry out their threat, they don’t need anything you would be able to give them. If the threat is real, you’re at their mercy and you have no way of knowing if acceding to their demand will actually make anyone safer, whereas if he’s lying you don’t want to be giving resources to that sort of person. This situation is a special case of privileging the hypothesis, since for no reason you’re considering a nearly impossible event while ignoring all the others.
If we’re talking about a metaphor for general decision-making, eg an AI who’s actions could well affect the entirety of the human race, it’s much harder. I’d probably have it ignore any probabilities below x%, where x is calculated as a probability so small that the AI would be paralyzed from worrying about the huge number of improbable things. Not because it’s a good idea, but because as probability approaches zero, the number of things to consider approaches infinity yet processing power is limited.
Weirdtopia? No—history. For example, the Bible rules allowed for capturing the enemy’s women as loot, having sex with their slave, and I’m fairly certain that a woman’s wishes in terms of consent mattered a lot less than those of the male in charge of her. I seem to recall that at some point in Europe the feudal lord or whatever could have his way with your wife, and you had no recourse. This, of course, probably has more to do with inequality than anything else.
As for consent, it’s … complicated. For one thing, it exists in the mind and thus cannot reliably leave a physical trace (because of how memory works by retroactively fitting facts into a narrative, not even the owner of the brain can be certain). And then there’s sleeping, and drugs, and mental illness, and changing one’s mind, and how we decided that none of the usual applies when the person is below a certain age. As a hypothetical example, consider a mute quadriplegic who can only communicate by blinking, gave consent, then withdrew consent halfway through the act but while their partner couldn’t see their eyes.
Besides, it’s not like any modern society would allow assault or harassment, so if they got rid of the laws concerning the special case where sex is involved, it wouldn’t really change much.