Ian Kerner, a sexuality counselor and New York Times best-selling author, blogs about sex on Thursdays on The Chart. Read more from him at his website, GoodInBed.

When you take your marriage vows, you’re pretty much making the commitment to never have sex with anyone else ever again. Wow - just writing that is scary.

With the demise of Arnold Schwarzenegger and Maria Shriver’s 25-year marriage making headlines, it’s hard not to wonder if long-term monogamy is possible or even practical.

As a sex therapist, not a day goes by that I don’t see people who are stuck, feeling as if they have to give up on their marriage, or give up on sex - or cheat. My patients have taught me that sex - or a lack of it - is one of the major contributors to marital strife between longtime couples.
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