I’m a male in my late 60’s with what I think is an unusual problem. My wife of almost 40 years and I have a good sex life and it’s gotten better since the kids moved out. Every two or three days, I give my wife a neck and deep gluteal massage and then she gives me a blow job. Sometimes I manually stimulate her to orgasm, usually while I’m in her mouth. We both enjoy this routine, but in the past three or four years, she has occasionally wanted vaginal sex, which we used to have, and I can’t get quite hard enough to perform. After I penetrate her, we have sex for a while, but I don’t orgasm. When this happens, I wash myself and she gives me a blow job, but she’s frustrated because she thinks the problem is her when the problem is all mine. She worries I...