You know...I don't think i am all that good looking but everyone else, even dudes my own age say I am pretty well featured. It's because that I don't acknowledge my own physical appearance that most of the time, when I am getting checked out (which is apparently alot according to my peers) I am completely and utterly clueless on the matter. I just don't worry about it to be quite honest. But there have been some situations where it was pretty clear when a women was either flirting with me or just sizing me up and those are the moments when my social weaknesses come into play.
Now...I can talk to women, skinny or fat, bitchy or nice....without a problem in the world. Comes from living in a family where I am outnumbered by a vast amount of females....But if I think your flirting with me...if I think you are taking an interest in me...Well...I don't know what happens, a sort of switch turns on and I'll start panicking as If I don't know what to do with myself. My voice starts stuttering, I start acting fidgety...and everything goes to all hell. I'm guessing it has something to do with the fight or flight response and generally I take the flight option, often avoiding contact with that person from there on out.
Now I do have Social Anxiety Disorder, so the things I described above could very well be that coming into play. When faced with a situation that I do not know how to deal with, my first instinct is to back the hell away and hope that I never have to deal with it ever again.