His and Her Health

I have been seeing my boyfriend fo almost a month. Everytimewe have sex, he can't seem to orgasm inside me (we use condoms) or when I perform fellatio on him. Instead, he masturbates himself until. I have never been with a guy that has had this"problem" before. He says he will eventually be able to, but I don't get understand this at all. He lasts for a very long time, and still cannot orgasm in me. Is this normal?