That would get you round the religious problem entirely. Or you can try "the holier-than-thou types" is you want to keep a religious notion.

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Note added at 23 mins (2004-12-02 22:40:35 GMT)
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i.e. The holier-than-thou types are the first to put out

Very, very similar - doesn't convey the vaguely religious connotations though, But come to think of it.... if you're trying to convey the message to a protestant audience, this may be suitable,

An option at any rate!

there's seems an obvious explantion which is similarly idiomatic in that the 'children' (maybe the people/demographic) are the first to give her away. Im sorry that's maybe too obvious. In short they may betray a principle or give the game away.

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Note added at 1 hr 21 mins (2004-12-02 23:38:54 GMT)
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Mary sorry. There isnt really a historical figure to match good ol\'jesus, so comparitively, model citizens or the really gifted. I guess.

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Note added at 21 hrs 32 mins (2004-12-03 19:49:53 GMT)
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I just spoke to someone in my house about this and they understood immediately - it does indeed refer to the followers of that belief are, ironically the first to either lose their virginity or are the easiest, much like paedofile priests

or even "neurotic sluts", "hypocritical sluts" if you wanted to take the blunt approach

I would leave out connotations to the cult of Mary. It's impossible to convey, and it doesn't seem essential to the gist of the sentence. In any case, I tried to incorporate Maria into the "Catholic" part...

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Note added at 5 days (2004-12-08 20:06:23 GMT) Post-grading
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Duca asked for a rhyme: Catholic girls like to give it a twirl!