This would probably be a pretty simple thing to mod out of the game at least if you know how to mod. For player created Sims it would just be a matter of disabling the new interface since not engaging keeps it the way it was before. Unfucking the NPC situation would probably require running a script to set them back to normal but the tools are likely already there. Sims already have an internal score of how heterosexual or homosexual they are, which determines what sex they romantically interact with autonomously. But they're all bisexual and can be directed to romantically interact with either sex by the player.