Not exactly a fair analogy. First off it is willful exposure to cp not incidental. Secondly the concern isn’t that someone is oriented towards children the concern is the action. We can’t and should never ever attempt to police a person’s mind we can however as a society demand that adults don’t rape kids. Homosexuality is not the same, the vast majority of western society is fine with the action. So even if you could demonstrate a link between watching gay porn more and being more willing to have gay sex it doesn’t matter.