I am not a porn addict but I do not see how it is a "mental poison", I don't even know what that is supposed to mean?
A guy that used to post here, AnabolicHalo, said that it’s not healthy for a man to look at sex scenes especially when another man’s penis is in sight. The focus of the scene might be the woman, but the sex organ of the man is still visible. AnabolicHalo stated that it’s an unhealthy thing for a heterosexual man to be exposed to. Most people here agreed with him.