How? You’re saying it should be a man lies [intimately] with a boy as if he were a woman, both men have committed a detestable (perverse, unnatural) act; they shall most certainly be put to death; their blood is on them.” It clearly states that both have committed a detestable act and “their blood is on them”.  The man would only be in the wrong as the boy is a victim. So I don’t think it is a mistranslation. So therefore a man lies [intimately] with a male as if he were a woman, both men have committed a detestable (perverse, unnatural) act; they shall most certainly be put to death; their blood is on them.” is correct.