Back in the late 1980s, I helped run a BBS called The Women's BBS (although men participated as well). We got a steady stream of guys -- mostly adolescents -- who came on pretending they were women, and almost invariably they were immediately tagged as such, because they had that weird inability to see their "characters" from anything but a male perspective. ("Hi! My name's Christy, and I have really big breasts, and I really love it when a really big man puts it in me!")

They usually got laughed off the BBS in short order.