I see a couple of acceptance problems with the device.
First, men a notoriously squeamish when it comes to their testicles. "Heating" without telling the temperature won't fly with many. I guess it doesn't have to be hot as it probably only needs to be warm enough to relax the cremaster muscles. If it has to be uncomfortably hot, I see little chance in the market.
Second, I'd expect the ultrasound to hurt. The epididymis is pretty sensitive to pain.
Third, it will feel like gambling as the female partner doesn't really know whether all sperm is killed or whether she will end up pregnant. And for the male, it will be a leap of faith as well. That should improve if a lot of users report no unwanted pregnancies, but in the beginning...
First, men a notoriously squeamish when it comes to their testicles. "Heating" without telling the temperature won't fly with many. I guess it doesn't have to be hot as it probably only needs to be warm enough to relax the cremaster muscles. If it has to be uncomfortably hot, I see little chance in the market.
Second, I'd expect the ultrasound to hurt. The epididymis is pretty sensitive to pain.
Third, it will feel like gambling as the female partner doesn't really know whether all sperm is killed or whether she will end up pregnant. And for the male, it will be a leap of faith as well. That should improve if a lot of users report no unwanted pregnancies, but in the beginning...