Someone asked me this PM so I will clarify it here.
100 posts is 100 posts TOTAL that you have on the site. Not 100 posts since the contest started.
You can view your total post count on any post you make (under your username to the left of the post). If that number is already over 100, you don't qualify (unless you just passed the 100 mark since June 2). You must have less than 100 total posts when the contest started on June 2 and pass 100 posts while we still have tshirts.
If you are already over 100 and don't qualify for this contest there are plenty of other ways to win a tshirt. Currently we have:
Erotic Story Contest Daily Swingers Board/ SwingTown Trivia