Sexdate with a beautiful 42 yo mother

I'm in a relationship with a man who's 28 years older than me. A sweetheart, I can't say otherwise. He does absolutely everything for me, and I do for him. Except in bed, things aren't working. Medication is preventing him from getting an erection. He finds it incredibly frustrating because he knows how much I love sex, so he came up with an idea. He said, "If you promise not to leave me, I'm fine with you finding a man to sleep with occasionally. I'd rather stay here, because that feels safer than going to someone else's house. While he's here, I'll go to a friend's, but if anything happens, you can call me, and I'll be home very quickly. Sweet, isn't it?"