The feature adds new options during the Create-A-Sim process.
Answering ‘yes’ to that last question means that who your Sim is attracted to can change through gameplay.
Croft acknowledged that shortcoming, saying it is a result of “technical limitations.”

“As stated above, mechanically, non binary Sims dont yet exist in TS4.
In the intervening years, weve taken important steps such as Gender Customization, Pronouns and now Sexual Orientation.
Its a journey still in progress, with many more steps to go.

Proper mechanical systems to fully support non binary Sims is another step in that journey.”
WooHoo was previously gated behind romance within The Sims 4’s systems.