So to sum up...you knew on some level what you were getting from the beginning and hoped he would change...but you're not willing to put your marriage one the line...so this is a big deal but not a deal breaker.
Not to say that's a criticism...but just the situation I guess. I also get the sense that he is a strict Catholic and in a sense might have views that sex is mostly for procreation (where you both seem to be getting the job done) and that when you're pregnant it might be subconsciously zapping his labido because it puts his religious beliefs to the forefront.
Why not think about other things he does not related to sex where he is more reserved. Are there some other areas of his life where he has issues or is unable to be more free wheeling? I'm just looking for a larger pattern that's not just about sex.
"The journey of a thousand miles begins with one step." – Lao Tzu
