Husband fetish

As of lately, my husband has shared that it would really turn him on if he watched another guy have sex with me. He doesn’t want to have a threesome, he just wants to watch. I’ve expressed that I would not feel comfortable having sex with another guy, let alone him watching me. He just says that it would just really turn him on.

Last night, my husband and so were having sex and then he starts saying stuff like, you want another cock doing you like this, you want him to pound you like this, etc. I didn’t say anything but he kept asking and it clearly turned him on so I went with it but felt totally uncomfortable.

I just feel very awkward from what happened last night. When we were done I just turned over and didn’t say a word. Is it normal for couples who have been together over a decade explore these type of fetishes? I just feel like it would destroy us in the long run.