The Rambam Issurei Biyah 21 (and the SA agrees):
? ????: ???? ??? ???? ???, ??????, ????? ???? ?????? ???, ??? ??? ?? ???–?? ??? ??? ?????. ?????? ????? ??? ???? ???? ?????, ???? ????? “????? ????? ?????? ????” (?????? ??,?)–?? ??? ??????, ??? ??? ??????. ??? ????? ??? ???? ????? ???? ???? ?????, ?? ??????, ??? ?? ??? ???? ????? ???? ??? ?????, ?? ?? ?? ??? ?????–??????? ?????? ???, ??? ????? ????? ??? ??????.
Go to your teacher, and ask her to show you sources. Never take her word for it.