Women get IUDs inserted with nothing more than OTC painkillers, generally. Especially in people who have never given birth it can be cripplingly painful and cause severe cramps for weeks.

I think it's impossible to compare these things accurately but women have been taking the pill for more than half a century. It's been proven to be relatively safe and reliable for most people. Something for men would be great but I'm certainly not going to risk future fertility with something that new and untested, particularly when my partner has a much more tested and safe alternative. On top of that, men have a very simple, effective, and safe option available - condoms. They have their own downsides but they don't outweigh the risk, pain, and anxiety of an injection in the scrotum.

Huh?

I would think that the pill, both the men's and the women's version, would be imminently more preferable to an injection any day of the week? Particularly injections which require preparatory injections to numb pain deemed to exceed acceptable FDA levels for humans. If there is a men's and women's version of a pill, and a men's and women's version of an injection, most men and women would choose the pill.

That seems common sense to me, not squeamish-ness. This pill will garner infinitely many more users. (I mean, assuming it works I guess?)

Because it's halfway to having a vasectomy. Disgusting manipulation of flesh.

So don't do it? But why prevent other people from doing it?

I'm not preventing anyone, I don't mind if people jab themselves.