Editor’s Note: Robert Stephan Cohen, a partner in Cohen Lans, LLP, is one of the top divorce attorneys in the United States, having just successfully represented Christie Brinkley in her landmark custody battle this summer. Past clients include Uma Thurman, Lorraine Bracco and various Trump wives. He is the author of Reconcilable Differences: 7 Keys to Remaining Together from a Top Matrimonial Lawyer.

1. If your husband has blocks of unaccounted-for time, especially in the evening or on weekends, beware.

2. If there is a family computer, log on and see what the search history, sites visited or navigation history and e-mail trails suggest. Find out where your "cache" is on your Internet browser and see if it is being cleared regularly; it may suggest he is trying to hide what sites he’s been visiting. Anything strange. There are laws affecting computer access and you should check with a qualified professional.

3. Check his cell phone calls if the bills come home to determine whether there are unfamiliar repeat calls. If the bills don’t come home, wonder why.

4. If he starts talking about a woman at the office or someone he met — even in an innocuous way — it suggests he has another interest.

5. If his sexual appetite with you wanes or changes in a material way it may be the beginning. My experience, however, is that it is easier for men to engage in sex with their spouse and others in the same time frame. It’s usually a dead giveaway when women stop having sex with their mate. They are wired in a way that generally makes multiple sex partners off limits for them.

Reminder: Before you confront him, see a capable divorce lawyer.

Mr. Cohen practices law in New York State. This blog does not and should not be construed to give legal advice in connection with any of the subject matter contained herein. You must always seek to speak with your own lawyer for legal advice.