Read a bit about this today. It’s reversible, cheap, but not on the market yet. Sounds like a worth while reason to stick needles in my sack :tup:
This source link has terrible ads, just a heads-up: http://www.ibtimes.com/articles/338049/20120507/new-male-birth-control-procedure-100-reversible.htm
Older article from Wired, including sack pics NWS!: http://www.wired.com/magazine/2011/04/ff_vasectomy/all/1
Basically it’s a positively charged polymer that effects the negatively charged sperm as they pass by, rendering them incapacitated. It doesn’t plug or block anything.
There is an interesting story behind how it was invented:
In the 1970s, he [Sujoy Guha, inventor of the procedure] began investigating cost-effective techniques to purify rural water systems. He discovered that if he coated pipes with a common polymer called styrene maleic anhydride, he could kill bacteria lurking in the water supply. The process took advantage of an electric charge differential existing between the polymer, which was positively charged, and the bacteria cells, which carried a net negative charge. As microbes traveled through the polymer-lined pipes and encountered the strong positive charge, the attractive forces pulled them apart.
When the Indian government began worrying about its rapidly growing population, Guha wondered if the same polymer could work for male contraception. After all, the vas deferens resembled a water pipe, and sperm traveling through the narrow tubes were analogous to bacteria. Guha ran some tests and found that the procedure worked perfectly…