It's not a good idea to go down on a girl you don't know very well. I'm guessing most of us in the mature man forum haven't been vaccinated against HPV and many vaginas have it. Now, girls and boys are being vaccinated against it but a lot of people haven't been vaccinated. It's not a mandatory vaccine. HPV leads to penile cancer in a very small number of cases and it can also lead to oropharyngeal cancer.
Condoms might provide some protection against HPV transmission but it can still be transmitted even when using rubbers. I doubt many of us want to use dental dams to go down on our women! Plus let's not forget that owing to the vagina's anatomical location, you are probably eating up a lot of fecal bacteria.
If your perceived SMV is high enough, she'll keep coming back even if you don't eat her out. And those girls who demand you eat them out are usually not worh it anyway. I remember back in the day, I used to eat a girl out for 10-15 minutes and then try to go forever and ever. Now, I just pound them out for a good amount of time and then blow my load when I feel like it. It's made zero difference to my retention rate.