By taking a second wife he pays the highest compliment to the first, by showing that she made him so happy as a married man, that he wishes to be so a second time. ↗
To be intimate with a married man, when my own father cheated on my mother, is not something I could forgive. I could not look at myself in the morning if I did that. I wouldn't be attracted to a man who would cheat on his wife. ↗
In Psycho IV, the time is five years after III, and Norman is out of the hospital. He's a married man, and he's finally learned how to love somebody and have natural sex without killing his lover. ↗