It is the woman who bears the brunt of a sexual encounter. She has to bear the child, not the man! So she has to take a decision when she has to go in the child making act.
Marriage is a sealing; a bond that gives the child a family, parents and siblings. A family provides space to chidlren where they grow and develop. A family absorbs an individuals hardships and anxieties and provides care and nursing.
By nature women are choosy as they must look for someone with committment. They are instinctive and inquisitive just to make sure they are not wrong.
But at the base, they are an emotional lot. They fall prey easily to the smart man's charm. They pick wrong signals and loose their feet. In sheer passion, they slip and fall down. They make wrong decisions and and feel guilty about them whole life.
But women of human species are smart. They make the man partner in child care activity; unlike the dogs. But why the man stick to the family for so long; Because he is also an emotional lot. He dotes his wife and loves his kids. So what if he does not give birth; he feels the birth pangs. His emotional bonds with the family are hard enough to stop him from straying