Just to be clear, are you talking about jealousy threesomes as having two girls who don't like each other (like Ann and Chloe) together, or straight-up cucking the other guys?
You're making the Japan trip sound like massive DLC, which maybe could be a thing later on where you & Anna start having millions in the bank and can afford multiple flights to seduce the Japanese women. For now I just want it to be the way to get Adrian finally out of the house so I can fool around with Anna on the beach (and maybe invite another woman to live in his room, hello Alice).