My 32 year old boyfriend (completely healthy, no medical problems) loses his erection during sex. Most of the time we have extremely good sex (we have been together for a month and are in love with each other), but once in a while he will not be able to hold an erection, despite the fact that he is aroused. Needless to say, it's an issue that makes him stressed. My question is whether an issue like this is psychological or bodily in its nature, as I tend to believe that it is psychological. I mean, if there was a bodily problem, I guess that this would happen all the time? I want to help and I don't know how to go about it. What is usually the cause of this? Can it be addressed somehow?
Thank you for your time!