I voted "often" as I haven't started hormones and venture out presenting female 2-3 times a week. I present male at school, but all of my school friends have seen my female presentation. I think I will be going full-time soon (sometimes I don't know what's stopping me), I just want to start HRT first.
I am also under the opinion that getting a glimpse of what my life will be like after transition is necessary before taking as drastic of step as HRT. Plus, it can only get easier, I figure the public will get less scary with some effects of HRT.
jenna