וַֽתַּעְגְּבָ֔ה עַ֖ל פִּֽלַגְשֵׁיהֶ֑ם אֲשֶׁ֤ר בְּשַׂר־חֲמוֹרִים֙ בְּשָׂרָ֔ם וְזִרְמַ֥ת סוּסִ֖ים זִרְמָתָֽם׃
And she doted upon concubinage with them, whose flesh is as the flesh of asses, and whose issue is like the issue of horses.
Rashi on Ezekiel
And she lusted for their concubinage [Heb. פִּלַּגְשֵׁיהֶם,] for their concubinage, to be a concubine to them.
Rashi on Ezekiel
those whose flesh is the flesh of donkeys [i.e.,] the phallus.
Rashi on Ezekiel
and...is the issue of horses An expression of a profusion of sexual intercourse, for they engage in sexual intercourse more than any other male animals.