save your unborn babies: low skids to lessen sperm count.

(via here)
the once popular fixed gear skid has now been scientifically proven to lessen sperm count. as we all once have done before, low skids that utilize the nuts to stem technique cramp up the vessel that runs the process of reproducing sperm. this position, when held over the course of time almost stops production- which isn't much when done in moderation. however, over extended periods of time (i.e. practicing skids) can be devastating. you can read more here. crazy shit.

jmik