There's an important difference between this procedure and a vasectomy: a vasectomy is not reliably reversible. Because of that, the only men who get vasectomi

There's an important difference between this procedure and a vasectomy: a vasectomy is not reliably reversible. Because of that, the only men who get vasectomies are those who are done having children. Some men might make that decision on their own, but most men don't make that decision until they are married (or in at least in committed, long-term monogamous relationship) and have discussed it with their spouses/partners. People in relationships like that are generally at a much lower risk of STDs because of the monogamy. If you roll out a treatment that is just as effective as a vasectomy, but is 100% reversible, and a whole new class of men will enter into the picture: men who aren't yet ready for fatherhood, but who want to be fathers someday. Many of them will not be in monogamous relationships. Some of them will not consider the risks of STDs as rationally as they considered the risks of pregnancy.