The war wages on! Dr. Oz and a panel of experts weigh in on an age-old argument: men vs. women.

Does biology or society fuel our biggest differences? Do these factors affect the way we communicate with one another? Are men or women better communicators? Watch to find out. 

Is a man or a woman more likely to have a one-night stand? Who gossips more? Click here to watch Part 2.

Are there certain degrees of cheating? Click here to watch Part 3.

Are we meant to be monogamous? Click here to watch Part 4.

After years of trying to get pregnant, doctors told Kelsi Pierce it would be near impossible for her to conceive a child. However, Kelsi got the surprise of her life when her mom volunteered to be her surrogate — and she found out she, too, was pregnant!