So lobsters, beavers, cranes, grey wolves, and bald eagles got it all figured out, while literally every mammal on the planet (especially Dolphins) use sex just to say hi, sometimes. Humans don't get to do it that way, though, because there's some really shitty humans that fuck it up for the rest of them.
>Jacob wanted…
Doesn't matter. He worked for 14 years for twice the headache. He could've just beaten the ever living shit out of Laban and took Rachel, telling Leah to keep up if she could see them running, and then r-u-n-n-o-f-t; but he didn't. Point is, he ended up with two wives because human nature.