When a male cannot have an orgasm himself, he will quickly learn to find his partner’s orgasms fulfilling. If his dominant partner is his wife, he will quickly master the art of giving her pleasure, and find her orgasms bring him more joy and satisfaction than his own brief spurts.
If the dominant seeks to try new things in bed, he will of course agree to it. While he may desperately want to penetrate his lover, he cannot, because he is inferior and his lover does not wish him to experience that sensation. Perhaps the lover instead wishes to penetrate him? Once chastised, he will willingly agree to it. Once he does, the pleasure it gives will be more than enough to convince him to try it again and again.
When a man cannot have an orgasm, he will also learn to find pleasure in other parts of his body. Simply being kissed all over will become extremely erotic. Touching and massage will provoke powerful responses. Teasing will be the best he can get, and he will willingly take it. Knowing that his partner has ordered his genitals to be small and soft, and then knowing that his partner is intentionally causing him to become aroused, will reinforce that his partner does not find his erection, or his penis at all for that matter, to be an important part of their relationship. The important thing is the man himself, and the obedience and service he provides.