I have had many experiences as I have gotten older where I do not O. I can't quite get there or I poop out for whatever reason.....Of course I do usually finish myself later on... just because it feels good.
This is called Male Orgasm Disorder, and it is a treatable condition. There are physical causes for it, but most are psychological. Bernie Z.'s book (TNMS) may address the issue, but I'd still recommend that sex-therpist I keep [poking] you to follow up on.
-- B.
Me 50, W 45, M for 26 yrs S25, D23, S13, S10 20+ year SSM; recovery began Oct 2007