after the date she's most likely coming back to her husband for more fufiling pleasure.
Whatever helps the husbands sleep at night, I guess.
No. The term "hotwife" is only used by those into a particular fetish, where he does not have sex with other women but gets off on her having sex with other men.
It has nothing to do with open marriages and polyamory.
Jealousy is "natural", hence monogamy. If people can "let go" of a possessive view of relationships, they can "let go" of giving in to any and all sexual desire. Ideally people would just stick to relationships with those that share their values, rather than trying to force their "natural" views on those that don't.
When it comes to relationships, arguing over whether something is or isn't "natural" has always been bullshit. Different things work for different people.