Bestiality is forbidden in several verses of the Old Testament. For example:
Exodus 22:19 Whosoever lieth with a beast shall surely be put to death.
Leviticus 18:23 Neither shalt thou lie with any beast to defile thyself therewith: neither shall any woman stand before a beast to lie down thereto: it is confusion.
Deuteronomy 27:21 Cursed be he that lieth with any manner of beast. And all the people shall say, Amen.
However, bestiality is never mentioned in the Ten Commandments (Exodus 20). The closest one is Exodus 20:14, which establishes the popular prohibition "thou shalt not commit adultery".
Is bestiality implicitly included in the concept of "adultery" used in Exodus 20:14?