Over 40 years my husband had 4 affairs all because desire was expressed to him, so he is opportunistic. The first 2 were during our first decade together, desire expressed to him, both short lived and just sex for both partners in the affair. The third, 20 years later, when he was being squeezed by my menopause and lack of sexual interest is the one that bothers me the most. With an older woman that was lonely, just lost her mother, and a customer. He says it was just sex because he felt sorry for her! Had he become completely desensitized to sex and infidelity. There was no physical attraction, he could ignore the age difference and even the unpleasantness of it, ending it because of the unpleasantness of it. Was he temporarily insane?