erection causes erotion

Erection: an attitude! of dick while seeing erotic scenes.

You know we have repressed desires such as lust that can stimulate us.I don't know the exact reason but I think one reason can be their repression as the holy prophet of Islam said:"definitely the humans are willing to what they are  forbidden ". To be fair  I should say sth about the other side.as an instance of a disadvantage I should say....