Is it a “red flag” that he has female friends that are bikini models?

He has different groups of friends and I’m a new addition in one , so I completely understand that he’ll be closer to others , I really don’t have a problem with him having female friends or even bikini model friends. But what I’ve been concerned about is their behaviour around him. I find it a bit inappropriate. Some of these girls have bfs, and even husbands and they have flings on the side which to me is a red flag. They are self promoted half naked models on IG, and they partake and host bikini car washes, and some other vulgar activities. Some of them touch him inappropriately and one girl even sat on his lap and looked directly at me when she did it. He was visibly annoyed and told her to not do that, she moved but laughed it off. Am I overthinking this or is it actually a red flag?

He’s not my boyfriend, but the way things have been moving, we probably might take this friendship to the next level. I don’t wanna date and then breakup after because of my issues with his friends’ behaviours. So that’s why I’m thinking of taking a step back from now? I also have been contemplating asking him about them but I don’t wanna seem controlling, especially since he’s been friends either then way before me. He’s a great guy and I rather keep him as a friend than completely loose him if things get weird.
Is it a “red flag” that he has female friends that are bikini models?
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