I think the word is 'slave-cunt'... I can't be sure....This rather cleverly-crafted crux may appeal to our nun-loving friends!
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(credit: sleinadflar on DeviantArt)
incidentally, I was trying to invent a word for a sexual fascination with nuns,
and found that there isn't really a distinct word for a female monastic in the Greek Orthodox Church,
they just use monachi, feminine form of monachos 'monk'. So 'monachiphilia'.