Halakhah for Sanhedrin 149:5
ולינסבה מינסב לא מייתבה דעתיה כדר' יצחק דא"ר יצחק מיום שחרב בית המקדש ניטלה טעם ביאה וניתנה לעוברי עבירה שנאמר (משלי ט, יז) מים גנובים ימתקו ולחם סתרים ינעם:
<b><i>MISHNAH</i></b>. THE FOLLOWING ARE BURNT: HE WHO COMMITS INCEST WITH A WOMAN AND HER DAUGHTER, AND A PRIEST'S ADULTEROUS DAUGHTER. THERE IS INCLUDED IN A WOMAN AND HER DAUGHTER' HIS OWN DAUGHTER, HIS DAUGHTER'S DAUGHTER, HIS SON'S DAUGHTER, HIS WIFE'S DAUGHTER AND THE DAUGHTER OF HER DAUGHTER OR SON, HIS MOTHER-IN-LAW, HER MOTHER, AND HIS FATHER-IN-LAW'S MOTHER.
Sefer HaChinukh
I have also seen about the matter of this commandment in the books of my teacher, may God protect him, that any woman for which betrothal (kiddushin) is effective - such as a widow to a high priest, a divorcee or released woman to a common priest, a mamzeret or a netinah to an Israelite and an Israelitess to a mamzer - are not included in the sexual prohibitions, for which one must die. Still, we nonetheless do not instruct any man to have intercourse with any woman - even if she is single, we do not instruct [it]. He should instead die from the illness that has come from his lust and not have her have intercourse with him or [even] speak with her, etc. - [as we see] in Sanhedrin 75a and the Book of Knowledge (Mishneh Torah, Foundations of the Torah 5:9). And the rest of its details are elucidated in Chapter 8 of Sanhedrin and in Pesachim and Yoma and in other places (see Tur, Yoreh Deah 157).
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