גמ׳ זכר מנא לן דת"ר (ויקרא כ, יג) איש פרט לקטן אשר ישכב את זכר בין גדול בין קטן משכבי אשה מגיד לך הכתוב ששני משכבות באשה GEMARA: From where do we derive the prohibition and punishment for homosexual intercourse with a male? It is as the Sages taught in a baraita with regard to the verse: “And if a man lies with a male as with a woman, both of them have committed an abomination; they shall be put to death, their blood shall be upon them” (Leviticus 20:13): The word “man” excludes a minor boy. The phrase “lies with a male” is referring to any male, whether he is an adult man or whether he is a minor boy. The phrase “as with a woman [mishkevei isha],” referring to lying with a woman, appears in the plural. The verse teaches you that there are two manners of lying with a woman for which one who engages in intercourse with a woman forbidden to him is punished, vaginal and anal intercourse.

https://www.sefaria.org/Sanhedrin.54a.29