Hubby and my fantasy

So here lately during sex something came up my hubby was asking about watching me and a girl go crazy on each other.. he said he wouldn’t touch either of us he just wants to watch us make each other go crazy.. and the weird thing is, it kind of turns me on. I don’t know if it’s because I know a girl can give me what I’m lacking or what... does this make me a horrible person and what does this mean?? I’m not sure how to feel about it as I’ve never done much less thought about it until now