Our expert says:
Having hypertension and being on blood pressure medication can affect your erections as they are very dependent on the blood flow to the penis and both of these can reduce blood flow to the penis. However, if it is happening only occasionally I don't think this is mostly a physical problem. People with erectile dysfunction usually also do not get morning erections.
I think if you want to see a specialist about this, I would recommend visiting a mens' health clinic
If you think it could be performance anxiety - there are other ways of completing the orgasm for your wife like stimulation with your hand, so do not feel compelled to complete it with penetrative sex. Just continue with manual stimulation of the clitoris and don't make a big thing about it. As you say, it does not happen every time. Sex is not about supposed to be only about performance but also about being loving to each other and this need not always be shown with penetrative sex. You could also experiment with letting her orgasm first and then allowing yourself to orgasm - this will take the stress of "timing" it just right off you!
Premature ejaculation is not the same as becoming wet during foreplay. You will definitely know that you ejaculated ( orgasmed) so I doubt if this is the problem. What you can do is to squeeze the base of the penis to delay ejaculation if you feel that you can't hold it until she is ready.
54 is not too young for Viagra, if it is helpful for you, use it.
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