Did anyone expect this topic would be anything but a breeding ground for homophobia?
Ditto.
A physical is not supposed to be pleasurable, even if some men cum during them.
We all gotta do it some time. I've never had a doc put anything up my ass either, but I know when I turn 40 I'll have...
Being tense and concerned about reaching a specific goal makes it that much harder. Also since you have had an orgasm before through masturbation, that's as good a thing as any to be doing while he is giving you oral sex.