וְאִ֗ישׁ אֲשֶׁ֨ר יִשְׁכַּ֤ב אֶת־זָכָר֙ מִשְׁכְּבֵ֣י אִשָּׁ֔ה תּוֹעֵבָ֥ה עָשׂ֖וּ שְׁנֵיהֶ֑ם מ֥וֹת יוּמָ֖תוּ דְּמֵיהֶ֥ם בָּֽם׃
누구든지 여인과 교합하둣 남자와 교합하면 둘 다 가증한 일을 행함인즉 반드시 죽일지니 그 피가 자기에게로 돌아가리라
Rashi
משכבי אשה means he inserts as a brush into a tube [i.e. in the manner of marital intercourse].
Siftei Chakhamim
One inserts. Because if not so, why write “in the same manner as with a woman?” Is there another way to lie with a male that the verse has to say “in the same manner as with a woman” in order to exclude this other way of lying?
Chizkuni
משכבי אשה, intercourse in the full sense of the word, not fondling or premature withdrawal of either party’s male organ.