The reason I ask is that I have a great deal of difficulty orgasming with a partner. Almost always I have to finish by masturbating in her presence, and sometimes that doesn't even do the job. When I was younger, it was fine. Today, probably partly due to age, I have not been able to climax while inside her, nor from a blowjob. In fact, I have never in my life been able to cum from a blowjob. I'm trying to just enjoy sex and not be too concerned whether I cum or not, but it's frustrating as hell.