Well, that depends on the rules. First of all, he would have to be rich enough to take care of all of us because I cannot see myself working all day to help support his other women. Secondly, I would have to be able to have a boyfriend or two on the side. Thirdly, I would have to be able to "get it on" when I felt like it, if ever. Fourthly, if he and I were to "get it on" he would have to have a condition in which he is impotent with other women except for me.
Thought it pretty good of him to bring it up front. Instead of getting some lady interested and then springing the idea on her.
But I'm like you.....not on your life.
My personal view is along the lines of "wouldn't touch it with a barge pole" but al least by making it clear it allows those of us not interested to steer well clear!