This is not a read and jerk off posting (at least not yet), it needs your feedback and answers.
Let's be honest for a moment, We all do it to some degree. I'm not looking for the lies, but the results. How did it go when you finally got together? Did the other guy say "Hell, no. You're not what I bargained for!" or just slip down to his knees and start sucking your dick. If he was horny enough to place an online personality, he probably just will go with it.
Conversely, have you ever responded to an online come on only to meet someone totally different than they advertised? How did you respond?