Decisions, decisions, decisions!

Hi, everyone this is my first time posting and being on this site. I've almost been married for two years and my husband and I want to have a baby. Its not that we can't get pregnant its just that we rarely have sex and it's been like that for years. That's just how our relationship has been for the past 4 years. Were not cheating on each other but I guess were not....Idk! But another reason for me posting this which I'm complete nervous about is everytime we do have sex he never ejaculate like never and I know that's the key to having a baby which we both want so badly. I'm an only child so my mom really wants a grandson and he is the baby so his family wants him to have a baby already and plus were the only ones that are married. I honestly needs help especially on the part about him.