>>4236
>>I thing what you fantasize about, being from porn or not, is essential to sustaining an erection.

Definitely not, you do not need fantasy to maintain erection, maybe there can only be problems with extremely strong erections that are almost painful.

You can fap to pretty much anything. You can do it even when you solve mathematic equations or read watch historical documentary.

I think it is not so much about what you actually do now but about your future expectations. So if you will know that solving this maths equation will lead to something what you want working on that equation will be just as sexy as watching porn.
this is even true for porn itself, because most oof the time is spent on searching and downloading while most sexy thing you see is that download bar indicating that movie of your dreams will be ready withing 10 minutes. and when it is actually on your hdd you spend your time watching download bar of another movie instead of what you just got.

"South park" did one episode about that issue