S.O.S.

Help please! My husband and I enjoy sex. But lately his being having this problem. He is hard as a rock. We both enjoying sex. But he can’t come!? He doesn’t get soft. He is getting pleasure from it but can’t come. We both are getting frustrated, specially him. He is 28 so I told him he needs to talk to a professional but his hardheaded about going to the doctor. Does anybody of you have had this issue with a partner or know someone that have deal with this??