>> a non-significantly higher rate of abnormal sperm concentration was found (47.1% versus 11.1%).
As someone contemplating a vasectomy, that's not quite the result I was hoping for. Sure would be easier to just keep my phone in my front pocket. Though, I suppose I'm not really sure what "abnormal" sperm end up doing. It's kind of implied that means they just don't work when the abstract starts out "Male infertility constitutes 30–40% of all infertility cases." but what if those sperm cause birth defects instead? Seems like that's a far from ideal result as well. As always... "Investigation using large-scale studies is thus needed."
There is research on ultrasound devices which do what you're asking. Designed to work as short-medium term contraceptives[0]. That isn't how smartphones kill sperm however, just as an aside for getting the same-ish results.
Thanks for that link. Interesting. There's also the evidence... which needs more corroboration to be sure... that heat above a certain temperature kills them or weakens them. Small scale experiments and survey of blast-furnace workers provided evidence for it. With both, the fertility went back to normal I think a few months after they left the environment where they were overheated.
So, initial evidence for sperm-killing heat to be a safe and effective contraceptive. Doesn't feel as bad as you'd think, either.
Perhaps you can boost radiation levels by leaving your phone on a call with a white noise generator and tuck the phone in the front of your [under]pants.
As someone contemplating a vasectomy, that's not quite the result I was hoping for. Sure would be easier to just keep my phone in my front pocket. Though, I suppose I'm not really sure what "abnormal" sperm end up doing. It's kind of implied that means they just don't work when the abstract starts out "Male infertility constitutes 30–40% of all infertility cases." but what if those sperm cause birth defects instead? Seems like that's a far from ideal result as well. As always... "Investigation using large-scale studies is thus needed."