tell me if this makes sense...
Look at the game cover art closely
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Darrel is the one in position at the gates of Nat's most intimate entrance, all of the rest are only supporting players with Ethan as the primary. IMO this was always going to be the primary path. The game choices are based on who the player chooses for Nat's interactions with. Whether Jenna, Peter, or Darrel (and more later on). King B gives Ethan an alternate in Riya, but Nat still remains the main protagonist, what if Riya meets Darrel? That being surmised, their ideal (fantasy) marriage would be a loyal wife Nat who fools around with others, at her husband's behest for his carnal pleasure. He will never have to watch porn again, or he could watch his wife in a porn while she's giving him head (or?) at the same time all the while recounting the scene he seeing, in the minutest details!