Even in committed relationships, such a pill would be an extra safety factor. There are plenty of people who got pregnant despite being on the pill or having an

Even in committed relationships, such a pill would be an extra safety factor. There are plenty of people who got pregnant despite being on the pill or having an IUD. It is a small chance, but it is possible. I imagine that still using those methods + using the pill for men at the same time would decrease that small chance to an even smaller one. And while the chance of IUD or the daily pill failing is small, it is non-zero, and it happens to people in real life. And the consequences of that small chance not playing out your way tend to be very costly in every single way.