From Wakapon
<math>\int \!\!\! \int_S\nabla \cdot T = \oint_C T \cdot \vec n</math>
http://server432.files.youporn.com/e4/flv/280002_round_butt_doggystyle.flv
<math>\int \!\!\! \int_S\nabla \cdot T = \oint_C T \cdot \vec n</math>
http://server432.files.youporn.com/e4/flv/280002_round_butt_doggystyle.flv