It's so interesting to get a peek into the work that goes into avoiding feelings. As someone who was a hotwife for a time, then fell in love with my 'swinging dick / bull', and subsequently transitioned into polyamory as both my partners were okay with it, I learned that feelings are not so easily avoided/governed.
I think anyone who gets into either of these lifestyles should expect to have a lot of great fun, but should also understand that it does come with at least some risk. We don't always get to choose who we do/don't develop 'icky' feelings for.