Sexercise and motivations

I haven't seen much on the subject of sexuality. I am 66 years old and stage 3+ emphysema. I will admit that rehab did help with independence, mobility and building confidence. That led me to ask the Dr. the question of what else I could do. My overall testosterone level was down. He suggested HRT therapy (hormone replacement therapy) for motivation and to prevent muscle loss. After a few lab tests and finding the right dosage, I now get a quick shot every 2 weeks. This has also boosted my libido substantially. Overall all I think it helps in many ways for muscle strengthening and other facets. The next question was, what else? He responded sexercise. Wow. I will say there is ultimate truth in use it or lose it; I get sore muscles I didn't even remember I have. Certainly limited in abilities, but I was also prescribed Paxil to help with anxiety which provides other benefits.I am curious if any other males here are seeing similar results or been given similar recommendations? Truth in the old saying "keep moving forward." If there are other helpful articles about intimacy can someone point me in the right direction (no pun intended). Cheers.