Dear Prudence is Slate’s advice column. Submit questions here .

Dear Prudence,

My sister just gleefully confessed to me that she is having an affair with her boss. She has been bored in her marriage since her husband started being a volunteer fire fighter and been away from home more often. She isn’t using protection because it “doesn’t matter” if she gets pregnant or not because her husband will be excited about a baby. He has wanted to be a dad since day one and they have been trying for about four years.

My sister has always had irregular periods and we all are working poor. Getting new eye glasses and dental work means going into savings. My sister has always been the pretty one and feels she settled by not going to California to be an actress. My brother-in-law is a

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