I started a thread about this a few months ago on the general board, but I thought it was fixed by now. It was not. Jade Rosa rolled a want to flirt with Eva about two days after Eve and Paolo woohooed in the closet during a party. There was absolutely no reason for her to roll this want. She is not particularly close to Eva and I never had her flirt with anyone before because she is so career-focused.
This is extremely annoying and I find myself in agreement with some of the others in this thread. I turned off autonomy for unplayed sims precisely to prevent situations like this. It has happened at weddings (legacy founder flirted with female bartender at her daughter's wedding) and other very inappropriate situations. If I want my Sim to be gay or bisexual, I will make them that way. I don't want my sims autonomously coming out when they're in the middle of a legacy or some other long-term scenario. When will this be fixed?
Props for fixing Summer Holiday, though. She is annoying and clingy enough without autonomously hitting on every female who is likely to reject her in the game (leading to bad moodlets).