I've been with my OH for 23 years; 17 married.
He has never had sex with me in a reasonable manner; by that I mean, once, twice a week; it's been once a month, if I was lucky.
I continued to "hear" all his excuses for it; and then married him (stupid I know).
It took 8 years of marriage to conceive.
We saw an infertlity expert in the interim and the Australian consultant quizzed him on his sexual activity; and DH said I was scary when I was ovulating; and he just kept his head down; and didn't approach me sexually.
The Australian consultant told him to grow some balls.
He didn't;
8 years later I became pregnant.
I would have loved another child; but I was too old and he was shit.
I have found size 8 knickers in my bedroom.
I think he is having an affair.
Once a month if I was lucky.