In my game I interpret unflirty as somewhat or completely aromantic/asexual. Raj decided to adopt an infant and a toddler, and then another infant, on his own. He's now a happy single dad of three teenage girls, and has written several cookbooks. Many of my San Myshuno families don't have kids or only have one-- depending on how long I continue that save, the city could be overrun with Rasoyas XD
(and Kibos-- Akira married a family-oriented townie)
PS I wasn't aware that he was unpopular among simmers, where have you heard that? (If it's true I honestly wonder if it has more to do with the belly than anything else, it could be that many simmers don't like to see a range of body types in their game.)