My partner and I have been sexually active for 2 years and during that time he has ejaculated once. Whenever we engage in intercourse he is fully erect and very excited but he finishes by having an orgasm but NO ejaculation. His explanation for this problem is that he used to masturbate way too much as a tween/teen he however did ejaculate during some of his previous teen relationships. He is now 25 and he no longer can, I'm worried it may be a problem like retrograde ejaculation or aspermia. I'm very confused because before this issue I always thought men had to ejaculate if not it was painful? Could previous experiences such as drugs or alcohol affect his reproductive tract? Please Help Me!?