Weird SIL Question

My brother got married earlier this year. Their marriage has not been good to say the least. She says they’re not having sex anymore which I think is odd but my brother is very private so I’m only getting one side of the story and also none of my business. She’s talked to me a little bit about it. The other day my husband sat in the bathroom and was talking to me while I was in the shower. He said I have something to tell you that’s been bothering me. I said ok what’s up. He was working on something for my brother and was alone with my SIL. He said she started asking him very personal questions about our sex life. He was working and talking and didn’t think much of it (she literally has no filter and will make sex jokes in front of my parents, it’s weird but we’re all just strangely used to it now). He said then she started to get graphic asking how he ate me out, how many time we each get off while having sex like super weird stuff like that. He said he stopped and just made a face at her like eww and he said she made a shivering noise and said ugh we have got to stop talking about this. He said he dropped what he was doing and let immediately. I 100% believe him there’s no question there. Would you be weirded out by your SIL asking your husband things like that while she was alone with him?