Shamelessly stolen fro T. Bone's Gulliver
Your body can squish, bend, and contort in ways that no human could ever hope to match. You have all the benefits of Double Jointed, but more so - you have a +6 to Escape and Climbing rolls and can ignore -6 worth of penalties for working in close quarters. In addition, you can squish through openings smaller than your body size would suggest possible, partially retract your limbs, and joint locks of any sort simply do not work on you. On the other hand, you are simply too alien to get any bonus to Erotic Art skill - most humans would find the idea repulsive and members of your own species expect it. This advantage is a better form of Flexibility and Double Jointed, you cannot have both.
Summary of benefits
Back to Modified GURPS Advantages and Disadvantages