Neither. I can't reliably orgasm even in my personal life, and most of my sexual enjoyment these days comes from indulging my fetishes (which I don't do at work) and the mental connection I have either to my fiance or FwB. I also dislike receiving oral and vastly prefer penetrative sex, but that hinges on the gent being endowed just right (both too small and too big are bad). As such work sex doesn't provide much stimulation at all.
However, I also don't fake it since I don't want to encourage people scraping all over my genitals with their facial hair or what have you. I just make sure to focus on them and apologetically explain I cannot O because of medication if asked (not actually true but easier than "I just don't climax, nope, no idea why!").