Someone on the Sexworkers subreddit recently posted asking How many guys don't cum from oral? % wise? Her concern was that a lot of her clients seemed to be struggling to cum from oral and she was worried she was doing something wrong.

My reply =

Porn dick is real. A lot of guys jerk off so often, and in may cases with a very tight grip, or in some very specific way, such that they find it difficult to cum from oral or sex.

Talk to your clients.

Ask them if they can usually cum from oral. If so, how do they like it? Communication is key. Do they want it hard and fast? Deep? Sloppy? Slow and sensual? Do they like their balls stroked or squeezed? Finger up the bum?

Stating the obvious but a dry mouth, and or stubble, is not conducive to a good blowjob and unless the guy has a thing for something involving your teeth which he asks for, no teeth.

Rhythm is good. Figure out a rhythm that's working and stick to it for at least a few minutes non stop without distraction or interruption.

Deep throat is great if you can do it but if you can't, a blow job that consists of you attempting to deep throat, gagging, catching your breath and trying again repeatedly is not likely to make anyone cum. Better just to take it less deep but in a way that you can keep up a good steady rhythm for as long as necessary.

Usually some grip and suction with your lips but not too much or it can be painful or even cause an injury tearing the frenulum where the foreskin attaches.

If the foreskin is too tight to roll back, be wary of giving oral without a condom. It's likely to be a cheesy mess under there. He should really see a doctor. It's very, very easy to get that issue sorted.

If it's taking a while, alternate between a nice, sloppy, steady rhythm blow job and a well lubed up with your spit hand job keeping about the same rhythm with hand job and blow job and without pausing in between. If there's enough spit involved, you can usually stroke with your hand over the head as well as the shaft. If the head of his cock is too sensitive to come into direct contact with your palm, even with lots of lube, you'll probably be able to tell from his reaction, or he'll tell you, or you can ask.

Even if none of the above is going to get them to cum, that's ok, you can get them at least part way there from oral and then switch to an oiled, or lubed, hand job to finish or even get them to finish themselves off with you assisting in whatever way works for them. He might want his balls or nipples licked, sucked, squeezed (he'll be able to tell you how gentle or hard he wants it if you ask). Or he might want your boobs in his face or to have you kneel over him so he can lick you while he jerks himself off.

No matter how great your oral skills are, it won't be 100% of guys who cum. If your communication skills are on point, you'll figure out what works for them and then most will cum. If you're asking the right questions. Listening actively to the answers and being aware of body language. Checking in often. Suggesting ideas and letting him know you're open to him saying what he likes so he knows you won't be shocked or offended.  Very nearly 100% of guys will cum. Those who don't, usually go to the session knowing they might not cum because it's happened before and they're aware the issue is theirs.

Happy sucking!