There is very little likelyhood of transmitting Hep C via sexual contact. I have been with Mike for 31 years and he was infected 40 years ago...sooo...
We have never used condoms. Ever.
We do not, however, share toothbrushes or razors. And we use the same sexual precautions one might if one had herpes...no touching parts if those parts have a sore or wound.
I keep surgical gloves at home in the event I need to don my nurse cap and perform first aid. He doesn't mind. And he is pretty accident prone...the usual cuts and bruises. And changing dressings for this or that over the years.
I have been tested for Hep C every few years, and, so far, nothing.