Health: The Halacha l’moshe M’isinai refers only to the oinesh; the issur was well known before.
The Midrash states that Avrohom Avinu stations himself at the entrance of Gehinom, all of his children he pulls out of Gehinom except for those who were Bo’el a Bas Neichar [Aramis] and thereby lost their “Ois Bris Kodesh”.
The prohibition of Arayos is the foundation of our connection with Hashem. This is precisely why Bilam Harasha advised Mo’av specificly to be machshil Klal Yisroel through Arayos. As the posuk states “V’Ra’ah Bicha Ervas Davar V’shuv Mei’acharecha”.