The authors of this study claim that same-sex couples respond quite similarly to opposite sex couples when it comes to "Demand-Withdraw" Dynamics. But what their actual data suggests is that gender dominates the demand-withdraw dynamic. Women demand. Men tend to withdraw, in response to demand.
This suggests two women are remarkably different from two men, and both will be different in their dynamic than opposite sex couples. But reporting it that way would violate a taboo: "Gender, Topic, and Time in Observed Demand–Withdraw Interaction in Cross- and Same-Sex Couples."