The problem is that people use the actual site as their fantasy, and to gain their pleasure.
It is very easy to be brave and outgoing using the site as in all essence you are anonymous, you can say and do what ever you want and have a whole different identity until you actually have to meet that person in the flesh.
A person shy in nature can be outgoing and talkative on the site, coming across as confident and sexually uninhibited, this all breaks down when he/she actually gets to the next step of having to meet the person they have been chatting with.