Finally. After requesting preferences since 2012. Thanks Maxis, if it's true.
To put it simply gays can remain gay and straight can remain straight as it should be depending on player choice. No more worrying (I hope) that my plans for one of my Sims won't be hijacked by bisexual Sims who have other designs on my Sims' preferences. Actually, it's been a big deal for our Sims to change on a dime any time a Sim was flirty with our Sims and mess up the stories in our heads. Asexual would have been nice, too, since I had many Sims too busy with other things to be bothered with romance...leave them alone, lol, they are on an adventure of my own imagination. My Doctor Who characters come to mind.
Now if they would just add some teeth to the faithful trait.
Interesting more people are excited about base game updates than they are about the pack details (in this thread). :p