1. Actually you can in fact reduce the desire to cpmmit sexual acts through classical conditioning and/or positive reinforcement, and it would be more efficacl then just killing them
2. Additionally, most humans have empathy which can be used to show there actions were wrong, admittedly this will only work on some of them
3. I agree, some would figure it out, but most would be caught or alternatively fear getting caught so much they don't try
4. While the creation and "consumptiom" of CASM is just as abhorrent as the act itself, from a utilitarinist perspective "consumption" of such material, particually if gotten without exchanging anything, is much better then people trying to be fufilled instead by commiting sexual assault, as there are fewer victims involved.

To be be honest, I would be fine with imprisonment till old sentences or the house arrest equivalent. I would just rather not impose a death penitaly unless the person wants to die.