If I wanted multiple partners, I wouldn't have gotten married, that's just the way I feel. Also, sooooooo not into sharing. I'm not icked out by other people wanting to swing, what consenting folk do with each other is none of mine as far as I'm concerned, but I'm definitely not into it and find the thought of doing it icky.
As for blood ... it's a body fluid. If you've ever gone oral on someone, or kissed, you've had their body fluids in your mouth. I've never been squicked by blood and, while I've never had any in quantity, I don't think it taste bad.