Being a sex therapist, I encounter this problem often. I know it's frustrating that you can't cum from oral. It's frustrating for your wife too since she paying my rates for this therapy. The only way to solve this is by lots of intense therapy sessions. The visual stimulation is just as important as the oral stimulation. Does your wife have nice big tits to look at like mine? Let's explore what makes your cock very pleased. Is it your sensitive tip? I can feel it throbbing in my mouth. Your shaft? It's so hard. Perhaps more stimulation is in order. Does your wife take care of your entire cock? Does she love it? Does she enjoy it? Sometimes that can make a guy hold back if he knows she doesn't love it the way I do. I can tell you like lips wrapped around your cock. So your problem isn't with getting oral, it's with letting your balls drain into her mouth and down her throat. Does she at least get you to the verge of cumming? You know how dangerous it is to hold it all back? Wouldn't it be nice if you didn't have to take your cock out her mouth and fuck her just so you could blow? Your moans tell me you're close to exploding...oh my...that's a lot of cum. So the real problem is that your wife just isn't good at it. We should continue your therapy so she gets her money's worth