Reversible Inhibition of Sperm Under Guidance (RISUG), introduced by Indian Biomedical Engineer Sujoy K. Guha in 1980, is an inexpensive, male non-hormonal birth control option that involves injecting a pair of polymers into the vas deferentia, coating its inner walls and inhibiting the sperm passing through. 2019 clinical trials with the ICMR resulted in a 97.3% success rate among 303 candidates and no reported side effects. It promises to last a minimum of 10 years.

Smart RISUG is the addition of copper and iron oxide particles to the original polymer, the former serves to conduct heat so that the compound can be microwaved and excreted from the male's reproductive system (whether naturally or not I can't verify); the latter prevents agglomeration (clumping) within the vas deferentia while magnetizing the polymer, allowing doctors to adjust the magno-elastic compound's exact location to further increase birth control capability, which is determined through X-Rays and magnetic resonance imaging. It isn't clear if this is opposed to the fact that the original treatment cannot or is difficult to be reversed.

Look, I wish I can give a more elaborate comment but I can't research competently and fully comprehend scientific research papers. I'd like to, but I don't know how. For now, I'd like to shout to the void that this exists, as in: "He~y! There is a cheap, non-hormonal male birth control option which is the equivalent of Women's IUD that has been in development for over four decades. Let's talk about it!"