How careful do I need to be about injury
It seems to me that there are two common injuries:
1. Tissue damage which results in losses instead of gains
2. Nerve damage which results in less sex pleasure
First of all, is that correct?
Are those results permanent?
How long can it take for these negative results to develop?
How easy is it to cause injuries? Are there warning signs like a certain kind of sensation or something?
How common are injuries for newbies? Is it something everyone does at first?