It could be phallic issue. Males are seen to 'give' sex, while females 'receive' it - at least in 'abusive' cases. Men have more 'tools' for abuse, at least concerning traditional 'rape'.
Would the 'Miss Teacher Bangs a Boy' episode of South Park have been accepted if it were the other way around, instead based on a real life case of a male teacher in relations with a female minor?
Doubtful. Justified?
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