Are male Tech-Geeks more corpulent?!

What made me think about this topic, was a combobox of shirt-sizes I came across during my speaker registration for TechEd 2007 in Barcelona, last November.

TShirt-Size

Why are there T-Shirts in sizes until X-X-X-X-X (5!) L ??

Well.. one possible reason: all shirts were smaller than usual. It turned out XL fitted me perfectly (while it is normally not my size).