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Vasectomy does nothing for venereal diseases. Ok, it may reduce the transmission of some diseases, but not to a safe level.

But I remember there was something like 'easy and cheap' vasectomy (still in research) being done by injecting polymers in the Vas Deferens

Ok, found the wikipedia for it: http://en.wikipedia.org/wiki/Reversible_inhibition_of_sperm_...

Agreed, but I think the main reason for people using condoms is to reduce pregnancy. The STD prevention is just a value-add (or at least that's what the Neurosyphilis voices in my head are telling me)

Once you have a steady, trustworthy partner, condoms are mostly used just to prevent pregnancy.

So a cheap and easily reversible vasectomy wouldn't eliminate the condom market, but it would certainly disrupt it I would think.

I would assume they're focused on STIs, HIV and AIDS rather than decreasing pregnancy rates. Whilst vasectomy reversal would disrupt condoms, male anti-birth pills (getting ever closer to production) are more likely to achieve what you're thinking.

I think that was a joke

Some products are being tested. http://www.wired.com/magazine/2011/04/ff_vasectomy/1

And/or bring DRACO to market: http://www.ll.mit.edu/news/DRACO.html