Among many excuses Donald Trump's campaign has offered for his failure to outshine Hillary Clinton in their first televised debate this week was his reluctance to bring up Bill Clinton's infidelities, a reluctance, they say, he might overcome the next time they meet.
But what exactly could Trump say on this subject that would not be worse for him than for her? He is not running against Bill.
Presumably he would not be quite as disingenuous as one supporter, former New York mayor Rudy Giuliani, who has suggested Clinton is "too stupid" to be President because she appeared not to know her husband was unfaithful to her. If Trump tries that on, she will be ready.
In fact, on the evidence of her performance on Tuesday she has been well prepared for anything he might throw at her. If he brings up her marriage, it is not hard to imagine her turning it to her advantage.
First, she would look at him with utter disgust. When he finished she would wait a moment to let the audience's disgust hang in the air. Then very quietly she could tell him the meaning of unconditional love and her commitment to her marriage and family.
The irony might be lost on her four-times married rival but not on the audience and viewers. She might add that she offers the same commitment to the country at this election.
If Trump is better prepared next time he might work this out for himself, and leave what is private well alone.