When one person in a marriage is going to the Internet to get sex, it erodes the intimacy in the marriage.

A lot of people are engaging in Internet sex. But for people who are doing it regularly or are substituting their intimate relationships for online sex, we're talking about people who have intimacy issues.

When you are using a long-distance method to achieve sexual intimacy with a stranger who you never get to know, you are not achieving true intimacy. And if you are using that on a regular basis, it's preventing you from getting sexual and emotional intimacy in your life. Anytime you prefer to have online sex to actual human company -- a friend calls you up and asks you to dinner and you choose not to go because you'd rather engage in online sex -- that's when you're headed for trouble.

It's cheating if your spouse considers it cheating. It's hard to give a blanket definition of cheating, because it's based on the morals and beliefs of the marriage. But what matters is: does your spouse consider it cheating?

The power of the Internet players, and the investments they're making in video, is a threat in and of itself.

Sex changes and shifts throughout our lives, depending on our age and depending on what we’re going through.