I surprised the hell out of someone by saying I was physically female.

They were like "o.o No way! You read as male!" I've gotten that ever since I was 12/13 and started to go online. If they found out I was physically female they were all shocked. I've had just about everyone online tell me that I come off as distinctly male online.
On putting in emoticons: I use an insane amount of emoticons from "

" to " ^_^ " to " <(^.^<) ", but even then, no one ever guessed I wasn't physically male. I use the emoticons for the same reason that aelon515 said. It helps to make sure the proper tone comes across in the post and because " ^_^ " is a silly cut icon.

They might have made me read as feminine (which I am), but never female.