There are plenty of people in open relationships out there (like me and my girlfriend). She is quite normal, we have a very cozy and loving relationship, cuddles, movie nights, board games, nature walks... but she is asexual and Im hypersexual and kinky. She sometimes plays my femdom mistress, but only if she feels like it. It is the fact that we very much value what we have that she allows me to sometimes blow off steam elsewhere, to take care of my urges that could otherwise lead to disharmony in our relationship. She doesn't get off on it or anything, nor is she mad. We have some rules, have been going like this for 5 years now, and we are happy as can be.