This is a tricky one @jackh. I haven’t used condoms, but I have also only had one monogamous sexual partner. I agree with @EarthMama that, for me, that helps me justify the risk. I think the choice is about acknowledging your personal risk. STIs like herpes, and even gonorrhoea can be transmitted during oral sex.
Some folk definitely do use them – they make flavoured condoms, after all!