We read stories on here all the time about thirds who mess up. Well this time the problem was me. I am a slut. I don't hide it. I have multiple partners who each have their own kinks and limits. For example, I have regulars that are ok with threesomes but not gangbangs, we play with couples that are ok with BDSM and others who are only cool with vanilla sex, etc. I'm usually pretty good about talking to people about their limits and preferences before we have sex. But this time I forgot. It involved three partners. Two were fine with everything, but one was not. We did meet and talk before sex but we got off topic. We never got back around to discussing limits. And that's how I inadvertently crossed a boundary. He did make me aware of the issue and how he felt disrespected. I thanked him for letting me know, and apologized. I see the mistake I made, and I know what I need to change going forward. I guess I'm posting this as a reminder that sometimes the couple (and not the single male) can actually be the ones in the wrong, and to always remember to get explicit consent before you involve others in your kink. Even if they are involved indirectly and you think it is something that they might like. Even if you've told them about something similar you've done in the past and they find it interesting.