We need consider the bond between the women. In the modern context the second wife would be initially view as a competitor or enemy by the first wife. Perhaps in due time they can develop a sorority bond, as with the case of concubines. This bond may not cause them to seek sexual gratification with each other. If the husbands practise orgy with his wives then there would be a likelihood. Then the question is would the husband do such things. I am incline to think that the husband will initially have to settle their rivalry before he can encourage them to orgy.

It weird that nobody seem to answer the question posed by the opening thread but commented on the pros and cons of polygamy or polyandry.