Is it really that bad to lose them? Well in a way yes, it means that you know from the start that he will not be able to get natural erections* and will have to hope that injections or mechanical aids work for him. On the other hand, you could save both nerve bundles and still find that he is totally impotent and has to rely on tablets, injections or pump. Nerve-sparing surgery does not guarantee erections - it only increases your chances.
You have to make your own decision but personally, I would prefer to reduce the risk of not getting it all and live with the certain knowledge of needing help with erections rather than risk needing further treatment because some cancer was left behind and find he can't get an erection anyway.
*There is a member here who has regained natural erections after non nerve sparing but this is extremely rare and the urologist thinks that possibly a few nerves were left behind.
Edited to say that tablets (viagra, Cialis etc) don't work for men with no nerve sparing
Edited by member 27 Oct 2017 at 14:44
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