I’ve been with dh since I was 21 - I’m late 30s now and the sex has never been brilliant.
It started out ok ish but then I found he’d given my chlamydia after telling me he was definitely clean. He has never liked using condoms. After that it left me with a range problems - I don’t know why as I didn’t have it long - but we never really got back on track. Sex became painful and has remained so ever since really. I don’t know if it’s a psychological thing.
He doesn’t seem that bothered and the only time we’ve ever really had much sex was when trying for dc. He won’t give oral sex and his idea of foreplay is to ram a couple of fingers in and out of me as hard as he can for a few minutes and then climb on. It’s over in less than ten minutes. He always comes and I never do. Unless I finish the job myself after. 
I feel like I could have another 40 years of this. It’s not the only thing wrong in our relationship but to me it’s becoming more and more of an issue. He doesn’t seem hugely bothered about having sex, although he usually instigates it when we do because actually it’s so rubbish that I don’t bother anymore. We probably have sex a couple of times a month but that’s a recent development. Until a few months ago it was less than once a month. I asked him if he was happy with our sex life and he said yes. 