My wife loves to watch whenever she can. Not only her, my friends wife too, our old neighbors wife included. I'm sure that I could attest to more women, if given the opportunity. Its a toss up between they are really into it, or they just want to see their husbands doing something they never expected to see.
My wife had always enjoyed watching me and my bud sucking cock. We'd take turns as she played cheerleader and once we were in the 69 position she was soaking wet wanting the two of us to fuck her at the same time. Made for some very enjoyable evening together.