Differences | Forum

Depends on the culture from what I'm able to research

Yeah same here

As I understand it a "sister wife" is someone who is only physically intimate with the male in the relationship. A "bi sexual" relationship is when the all partners are physically intimate with each other. So an example of a "sister wife" scenario would be me (husband) having a sexual relationship with my wives independently. One wife never with the other. A "bi sexual" scenario would be my wives having a sexual relationship with each other and not with me present. Otherwise that would be more like a threesome. I wonder if this helps. 

A "sister wife" is a common term for two women in a polygynous relationship which the type of polygamy between one man and multiple wives. Typically in this relationship the wives are no bi-sexual and do not have sex with each other, just the man. Most faith based polygamist (Judeo/Christian) practice this form of polygamy.

If a man and two women are all in a marriage relationship where they all have sex together that would be considered group marriage which some consider a different form of polygamy.

Polyandry is polygamy where there is one woman and multiple husbands. It is very rare.