Recently after only having WA I got some more expansion packs, Ambitions, Late Night and Generations, so i've been trying out the new features and I am assuming it was some weird glitch because the stylist career changed my sims husbands gender preference.
Last year I made a self sim and plonked her in Riverview, after a couple of weeks play and her showing no interest in anyone one evening she met a newly aged up Dallas Shallow and it was the most instant attraction i've ever witnessed between two sims, especially considering they only have electronic music in common, they became my favourite couple so I use them for pretty much everything.
Now Dallas is without doubt a ladies man, particularly where my sim is concerned, he adores her and is always showing her affection so it was quite noticable to me that he wasn't doing so, I blamed myself as with the new careers they weren't spending as much time together, this game he had rolled Charismatic on age up and after I moved him in had wished to join the stylist career.
He'd been in the job about 3 weeks and had mostly had male clients when he went to makeover Angel Lobos, my sim was a sculptor so I sent her to sell her latest ones at the consignment store and he met her there afterwards, the lady on the register took quite a fancy to Dallas and when I noticed he had rolled a starsign wish I assumed it was for her but upon mousing over it was for Angel Lobos!
I used Twallan's master controller to check his gender preference, it gives you the numerical value and negative numbers mean avoidance while positive means attraction, and sure enough he now liked men more than ladies, as I save incrementaly I loaded one from before he took the job and at that point he had absolutely no interest in men. I was under the impression only romantic socials could affect this and he certainly hadn't been doing those so I have no idea how that happened.
I just took it as a sign a fresh install was in order as that wasn't the only weird thing going on since i'd added the expansions. He's back to his old self in my new game and my sim is once more the center of his simmy universe so I can assume that glitch has gone.