In Proverbs ch. 4, the parental wisdom of experience was addressed to the children, with a focus on two imcompatible paths: The Way of Wisdom (also called the Path of the Just, 4:11-13,18) and the Path of the Wicked (4:14-17,19). The instruction, of ch. 4, expands upon the warning given to sons (in 2:10-15), concerning 'the Way of the Evil man.'
Proverbs ch. 5 expands upon another warning, also given in ch. 2, concerning the 'strange woman' (ie., the prostitute or the sexual partner) who is a stranger to you, because she is not your wife; and who is also a stranger to God because, by her way of life, she shows that she has forsaken His Word (2:16-19).
This is sex education, according to the Bible... not instruction in how to do it, but rather sober words of warning:
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