Originally Posted by chas1

The fact that sometimes it makes him want to pee when he doesn't need to is a classic symptom of a urinary infection. From what I've heard some of these infections are *not* always detected by doctors.
I ejaculated too soon after finishing treatment for a urinary infection & regreted it. It was uncomfortable & felt 'forced'. If I had an infection again I would leave it a much longer time before cumming again. The internal 'plumbing' in a man is all interlinked & urinary infections can make things hypersensitive yet ejaculation involves a powerful muscle contraction.
As a layman my advice would be for him to avoid ejaculating for a while to let the ejaculatory muscles settle down & to drink plenty of water to flush out the system.
I trust he has had his prostate checked by a doctor?