How often should you have sex with your SO?

We have sex maybe once every other month or so. Both of us are incredibly busy with work, he has two full time jobs and I take a lot of business trips. But we are newly married, about 8 months ago, and I just don’t feel like we do it enough. I’ve talked to him many times about this, but he said he just doesn’t like what he looks like right now, and to be frank, I don’t like what I look like right now. (Both of us got very comfortable in our relationship and gained weight) we used to have sex basically daily, and I just don’t think we have it enough. I’ve been trying to tell him I love him no matter what, and he knows. And then I tried to get him to work out and eat better but he just won’t. Is there something wrong with us?