The Sims 4 July 2022 update patch notes: Consoles Hopefully, this means an alteration to the feature will be investigated in the future.
The Sims 4 development team has publically acknowledged this limitation – it’s present due to the age of the game, and the inflexibility of its decade-old code structure.
However, the sexual preference feature is binary as it exists right now, meaning you can only select attraction to men or women. It’ll also allow Sims to choose who they’d like to ‘Mess Around’ with, or decide whether they’re still exploring their options. The new sexual preference mechanic will be multi-faceted, allowing you to choose who a Sim is attracted to, both physically and romantically.