I tend to be a pretty open minded person, so the way I see most things is even if I don't think its ok for me, that doesnt mean I think its not ok for you. this fits a lot of situations in life for me, from politics to religion to romance and beyond. I will use romance as my example tho since thats what brought the subject up.
so, I am a strictly monogamous person, but I have many friends that choose an alternative lifestyle. we get along just fine, I just have no interest in being romantically involved with them. I have had two distinctly different conversations about this. in one, a poly friend of mine asked me out, I politely declined. he asked why and I told him that while I don't have anything wrong with other people choosing multiple partners, it wasnt for me. he was very upset and said I was being prejudiced. when I later retold this story to another mono friend. they were shocked that I allowed a poly person in my circle. both of these points of view seem to me to be a bit extreme for me. but it got me wondering how the rest of the world views such things, so please feel free to give me some insight into another point of view.