Hi,
You are not alone. This is something that a lot of us have been through. I started off by putting pressure on DH saying right, nows the time, let's dtd. And he got less and less interested. I can't blame him really - i was kind of treating him like a sperm donor. Once we started Clomid - it was the nurses telling us to dtd, and he did what the nurses told him to, but sometimes it a bit of a struggle. After a few niggly fights, we talked about it and i did what the other girls said - sat down, explained dates, explained the importance etc. Then he asked me to please keep him involved, and he'd play his part and if we both made the effort, we could enjoy it all and still have some fun. He hadn't really wanted to know about ovulation and conception and all those other things, but he realised that if he wanted a family, then he was going to have to get some knowledge, so we could make our chances better.
Good luck Gidget, i'm sure you can get through this.