וְאִם־אֱמֶ֣ת הָיָ֔ה הַדָּבָ֖ר הַזֶּ֑ה לֹא־נִמְצְא֥וּ בְתוּלִ֖ים לנער [לַֽנַּעֲרָֽה׃]
그 일이 참되어 그 처녀에게 처녀인 표적이 없거든
Sifrei Devarim
(Devarim 22:20) "And if the matter were true — if virginity were not found in the maiden": This tells me only of natural coitus. Whence do I derive the same for unnatural coitus? From "And if the matter were true." "if virginity were not found in the maiden": i.e., if there were no witnesses to refute the witnesses of the husband.