My boyfriend keeps getting the urge to pee during head

So me (f27) and my bf (m38) have been together for over a year now and have been sexually active for most of it.

I have never made my bf cum from head or a handjob as he keeps saying hes going to pee and stops me. He only can cum from sex (P in V), but doesnt feel the need to pee during sex.

One time he accidentally did during head where a bit just squirted out but it really did seem like female squirt, it was just clear and it did have a slight pee smell but not super strong. Thankfully it just went on the side of me and not in my mouth or anything as watersports are not my thing or his.

The annoying thing is that the part that makes him feel good when giving head/handjob is also the bit where he starts to want to pee. And seeing as he actually has done this before, its a risk I dont wanna keep taking.
(yeah it is possible for a male to pee with a full erection for those who dont believe, i didnt think ppl thought it wasn’t possible until seeing past posts).

I really wanted to make him cum from head and a handjob yesterday and was going at it for a very long time, even asking him to guide me and show me what he wants me to do and what feels good, until he said he cant take it and was going to pee, he eventually went to the bathroom to pee and then i said now we can carry on he said it doesnt work like that (as he still gets the urge even when he has been to the bathroom before i give head, and that one occasion he peed accidentally was a time he also went to the bathroom before i gave oral).

Dont know if he needs a doctors check up as he is nearing 40 and dont know if it is age related or just his waterworks, but he doesnt seem to have any issues or incontinence.

Any advice on what it could be, how to stop it or other ways to possibly make him cum that includes my hands/mouth and not sex? Or even a different way to do it

TL;DR – my bf gets the urge to pee during head/handjobs so I can never make him cum from those, only sex.