1. _________ is the practice of having multiple husbands simultaneously.2. _________ marriage to someone outside one's social group.3. _________ is the practice of having only one sexual partner or spouse at a time. 4. _________ is the practice of having multiple wives simultaneously. 5. _________ marriage to someone within one's social group. 6. _________ is the practice of having more than one sexual partner or spouse at a time