How do people get away with affairs?

I mean, where do they find the time? Most of us are scheduled out the wazoo, and there’s no way to free up time for such a thing. And even if it were possible, one’s spouse could easily catch one out by making a phone call to where we said we’d be. Lying and covering would become a full time job.

If you’ve ever been cheated on, how did your spouse carry it off (at least for a while). Or, if you’re brave and have had an affair, how did you keep it from your spouse?

Finally, if you’ve been in this situation, did you or your spouse ever come clean about it? If so, was it because you were caught, or because you chose to come clean?