[mc32]

India pioneered a "reversible vasectomy" [1]. Basically they gum up the ducts from the testes. It does not have to be irreversible.

The thing to watch is whether knowing they have become, at least temporarily, infertile, will lead them to unsafe sex practices resulting in more venereal disease.

[1]http://newatlas.com/risug-male-contraception/18824/

[k_sh]

There's a YC company, Contraline[1][2], doing a similar thing.

[1]: http://contraline.com/

[2]: http://contraline.com/news/2016/05/13/contraline-is-accepted...