I fully disagree with you. Firstly, I don't think mentioning past romances naturally makes a backstory more rich, it just means there's more of it. Really, how much value do past relationships add? How much do they come up in games? Like I said, you at most get one major relationship that tends to directly impact the character's arc. For example Leliana in Drsgon Age: Origins. It's heavily improved that she and Marjolainne were lovers, and Marjolainne was a major part of her story in the game. Look at Oghren, he gets two past relationships mentioned, both of which are important to his arc, and he's never even a romance option. We never hear about Morrigan's past loves or crushes or romantic experience, or going to a later game, we don't hear about Cassandra's either. We don't actually hear about Dorian's past relationships, and his plot was centered around his sexuality. See also, Gale. Playersexual but his one big relationship, Mystra, is central to his plot. So really, making characters playersexual doesn't impact whether we hear about their past romances or not.