Dear reader: We believe you should not have sex with your mom/dad, stepmom/dad, sister/brother, half-sister/brother, stepsister/ brother, granddaughter/son, aunts/uncles, daughters/sons-in-law, sisters/brothers-in-law, and that it is a pretty safe bet that you should avoid poly-amorous relationships with members of the same family, or your own family. Apparently, so does the Bible.