What does Leviticus 20:15 mean?

“‘If a man lies with his daughter-in-law, both of them shall surely be put to death: they have committed a perversion; their blood shall be upon them.

“‘If a man lies with a male, as with a woman, both of them have committed an abomination: they shall surely be put to death; their blood shall be upon them.

“‘If a man takes a wife and her mother, it is wickedness: they shall be burned with fire, both he and they; that there may be no wickedness among you.

“‘If a woman approaches any animal, and lies with it, you shall kill the woman and the animal. They shall surely be put to death. Their blood shall be upon them.

“‘If a man takes his sister, his father’s daughter, or his mother’s daughter, and sees her nakedness, and she sees his nakedness; it is a shameful thing. They shall be cut off in the sight of the children of their people. He has uncovered his sister’s nakedness. He shall bear his iniquity.

“‘If a man lies with a woman having her monthly period, and uncovers her nakedness; he has made naked her fountain, and she has uncovered the fountain of her blood. Both of them shall be cut off from among their people.