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Agreed. I'm not sure why the Church has been so reluctant to state the obvious.
I don't understand it, either. They seem paralyzed.
They get bogged down in details, rather than taking a clear stand, I think because they are blinded by the culture, in which "anything goes" unless it's illegal.
It just occurred to me that the behavior of this man would still be sinful ... even if he weren't a priest ... even if the recipient of the smut were not his student ... even if they were the same age ... even if one were a man and the other a woman! In fact, I can't think of any situation in which one person's mailing nude pictures to another wouldn't be sinful; it seems morally parlous even in marriage.
We've become so focussed on the homosexual transgressions that we need to bring back to the forefront, the truth that the only morally-acceptable venue for sexual activity is in a Christian marriage.
I'm sure you can imagine the outraged shrieks of "Taliban!" that would arise if I mentioned this on a more general FR thread ... so maybe it's understandable that the Church spokesmen don't go back to the foundation and say, "This behavior is sinful: no matter who, no matter when, no matter how old, no matter what sex ... this is wrong."