His libido is so low!

My fiance and I maybe have sex once or twice a MONTH. I don't have a high sex drive but it's certainly not THAT low. He warned me about it when we first got together and now that we are planning to conceive next year I'm wondering if his lack of drive is going to get in the way. And when we do have sex, he rarely ejaculates, or climaxes. Says he's just happy knowing that I was satisfied, and that it's the way he's always been. I'm starting to wonder if maybe he should see a doctor about this, but I know he's not the type to admit to any one else he has a problem. Has anyone gone through this? If so, what's your advice? Thanks in advance!