Where a tiny blob of something is inserted and hardens inside the vas deferens, permanently blocking the sperms exit.
Years later when you want children a tiny incision is made in the vas and the blockage is popped out.
no messing with anybodys hormones.
Vas-occlusive contraception methods are expected to have similar side effects to vasectomy, such as formation of sperm antibodies, though with lower rates.
But... i have never seen it offered in the Western World as an option.