Can't go more than one round
People:
I (51M) am wondering if this is part of aging or it can be compensated.
My partner and I went for first round without problems. I was able to get it up again in about 15-20 minutes. But the moment I started thrusting I would lose my erection. She was able to revive it after pulling out, but it kept going soft when the penetration resumed. It didn't matter if I was doing it standing up or lying down, but as long as I wasn't thrusting, I had no problem staying hard.
Did anyone experience something similar and what could be done? I was considering the possibility of using a cock ring, but she told me it would make things worse in the long-run (which I agree).
Thanks.
PS: I was recently put on blood pressure medication, but this issue already started before. Otherwise this is the only med I am on.