My family knows as even the pastors at my church - both aren't exactly happy with it, but they understand it's a means to support my kids and family. They also understand that I am NOT content itself or am with content but basically in administrative role.
They could give all the reasons Mark suggested but are wise enough to realize that porn will be there even if I wasn't but also that there are other things outside of porn that destroy family's such as alcohol - gambling - or for that case, the opposite sex since cheating on your spouse happens at the office or anywhere.
Porn is a tool - put in the wrong hands can be used negatively, but in the right hands can help and relieve tension to those who don't have other means.
Assuming that CP is acceptable to anyone is like saying creating alcohol in beer facilities supports drunk driving and wife beating or aircraft manufacturer's are guilty for 9-11
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