My Husband's View On Sex Is Odd

Me and my husband have good sex life, we don't have any kids but are slowly creeping toward the "we aren't trying to have kids but also aren't not trying to have kids either" territory. Anyways last night we were watching a movie and a threesome scene came on and I jokingly asked him if he would do a threesome and he shrugged and said sure. So I asked him if he would be okay if it was me, him and another guy and again she said sure. I pressed him why he was so okay with it. He told me that he knows even with another guy that I love him and that anything like that would just be purely to feel good, no emotion to it. So I asked him well what if it wasn't a threesome, just me and some guy and it was just purely for sex, nothing else. He said well my pussy is his and his only, you know the whole not trying but not not trying for a kid thing I mentioned earlier and he said my mouth and ass would be fine. I was kind of taken aback because this was kind of a thing I did not expect to hear. He also said that I would have to trust them, and not some stranger off the street. Figures if I was to wear a condom for butt stuff if it broke then if it was someone I trusted, there was a decreased chance of any STDs, but he did say if i trusted them then I also didn't need a condom for butt stuff, only if I wanted. I was like anyone I trusted and he said yes, he would not care. I laughed and asked him what about my brother or my dad and he legit said "sure, I know you trust them and sex is sex, you'd just do it to feel good". I was like shook, he was so nonchalant about it. I asked him if he would do or has done the same to other women and he said no because he knows I am not like him and would no appreciate me doing that behind my back or even if I knew. I kind of stopped talking about it at that point. I don't plan on ever doing anything or sleeping with someone else, let alone my own family. I am just, bamboozled for lack of the better word on how someone can think like that and be okay with it. Like I still love him and maybe he was just saying shit to wind me up and get me all weirded out but he seemed serious. Like my dad and brother? What the hell. Am I overthinking things?