Been doing it since I dunno, 2000 maybe. It's for a few reasons, I don't especially love shaving but back when people were whining at me for having hairy arms/legs, and if I shaved them, I figured I might as well shave most of the body hair off including the face. It always confused me why women seemed squeamish about shaving their faces when they'd bother doing the rest of the body and wind up with a fem-mustache all the same which is probably the most masculine and obvious bit of hair they could think about leaving behind after all that effort. I later found it was because of the association of maleness that most of them wouldn't take a razor to their face.
But yeah I've been doing it for ages, for no particular reason other than it feel good, gets rid of the little hairs and I think it gives the face something of a "deep clean"/exfoliation too.