But what we do know is that while questions of infidelity grab the most headlines, having an extramarital affair is not what's behind the breakup or divorce of most long-term relationships.
The AARP Sex, Romance and Relationships Survey on the sexuality of people 45 and older found that extramarital affairs happen for only a relatively small number of couples.
Dating may also involve two or more people who have already decided that they share romantic or sexual feelings toward each other.
These people will have dates on a regular basis, and they may or may not be having sexual relations.
And although we don't celebrate divorce in this country, we are not afraid of it, either. Did you or someone you know divorce after a long-term marriage?
What were the contributing factors and what advice would you give other couples struggling to hold it together?
Sadly, and often with great affection for each other, the couple say "enough." And, yes, couples are saying that more often these days. And then, of course, we're now looking at the aging of the boomers.