I agree with Fal, another contraceptive for men could be useful for those who are in a relationship where the shot is the best alternative for contraception. Maybe the girl has problems with pills for example which can also lead to fatal blood clotting and other adverse effects on health.
Furthermore, I agree that it's a bit egoistic to expect the girls to pump themselves full of chemicals without being willing to do the same. I don't know about this shot, but perhaps the side effects are not so bad and overall, it could be a safer alternative than many of the female contraceptives.
As for casual sex, as I said, you could just keep using condoms. I wouldn't get a shot if I didn't know if I was maybe going to have casual sex. Rubber is (probably) easier, safer (protects against STDs, no side effects) and cheaper.
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