http://galleries.burningman.org/filestore/3/3/6/4/8_2eed28eed8e3daf/33648pre_f81eea896dadf74.jpg?v=2013-08-23+16%3A18%3A11
Sperm crossing
http://galleries.burningman.org/filestore/3/3/6/4/8_2eed28eed8e3daf/33648pre_f81eea896dadf74.jpg?v=2013-08-23+16%3A18%3A11
Sperm crossing