Women with DHs with low testosterone.

How do you ladies do it!! My husband can preform just fine but it's getting him to just simply want to. We are TTC for the second month. Last month he did pretty good. We missed one of our most important days to BD because he was just wore out. But this month it's like he doesn't even want to try. I got a positive opk this morning and a negative this evening. He wouldn't Bd with me last night but will tonight. I'm worried we missed our window because he just didn't want to do it last night. I'm so frustrated and just don't know how to do this TTC thing when my husband doesn't even want to Bd with me. He says he wants a baby but apparently not enough to do what it takes. Advice please!!!