There are no rules about sharing one's sexual history or past relationships with a present partner, but the topic does come up. Whether or not to disclose is a personal choice, but it's not always an easy one.
Online dating has been around for two decades now, but many daters are still on the fence or resistant to using it. While the practice may not be for everyone, it seems to be a permanent part of our culture so it's worth weighing the benefits.
While there are not hard and fast rules about how much sex a couple should be having, research confirms that a large number of marriages lean toward less sex than more.