There are all sorts of techniques for men to perform better sexually - which start out by trying to teach men how to avoid ejaculating. It is possible to have an orgasm and have it be the complete real deal without ejaculating. It is also possible to ejaculate and be left feeling hollow and empty, having felt like the orgasm was missing. Your man has an advantage with these systems. He is to be congratulated. He could even learn to have multiple orgasms in a single session, without losing his erection. You could find stuff online by searching for multiple orgasms for men. Or kegel exercises for men. The author Mantak Chia is well known for teaching this kind of thing.