I have no problem with implied promiscuity between characters in the Marvel Universe, as destro notes below, it's nothing new and adults do have sex in the real world. However, I wholeheartedly agree that ending the one marriage that was working in the MU -- especially with one of the most crap-tacular reboots/resets ever -- was stupid beyond belief.
On a related note, my girlfriend has an Indian farther and an English mother and I would never have known that she had any Indian ancestry at all had she not told me. She has very dark hair (but then, so too do many people of English origin), but her skin is every bit as pale as mine. Interestingly, she is the most English looking of all her siblings, with the four children in the family ranging from "very Indian-looking" to "not very Indian-looking at all". It seems that skin colouring among the offspring of mixed race parents is a bit of a lottery.