Uncle-Nephew Incest
"You shall not uncover the nakedness of your father's brother"—Leviticus 18:14.
It is forbidden for a man to engage in homosexual relations with his father's brother. One who does so transgresses two prohibitions: the general prohibition against homosexuality as well as this specific prohibition.
Adultery
"You shall not commit adultery"—Exodus 20:13.
It is forbidden to engage in adultery with a married woman.
Relations with a Menstruating Woman
"And to a woman during the uncleanness of her separation you shall not come near"—Leviticus 18:19.
It is forbidden to have sexual relations with a menstruating woman during the seven-day period of her ritual impurity—and afterwards until she immerses in a mikvah (ritual pool).
