Lack of sex

So it is like pulling teeth to get my husband to have sex with me and I’m getting sick of it. What can I do? A year ago, we were in rough patch in our marriage and both said hurtful things. We have since then apologized and moved and are doing so good. He claims that it just takes time for him to want to be close again (meaning sex-bc he don’t want to get hurt). I feel like this is a cop out but I don’t know. I really think he’s got low testosterone or something but he won’t get checked. We are trying for a baby and he seems to think one time a month should be fine. Lol It’s driving me crazy and I don’t know how to deal with it. Everything else in our marriage is good. I just don’t know what to do. I feel like even when we do have sex, I have to beg for it.