Ultimately, women have more at stake while dating because they face higher "sunk costs" — a woman can carry the child of only one man at a time, while a man can impregnate many women.
2
她说她怀孩子的时候,她没有跟比的男人发生过关系,所以这个孩子一定是他的。
She said that, at the time the baby was conceived, she hadn’t slept with any other man, and so the boy must be his.