When I was younger I was adamantly against open relationships. Over time my viewpoint changed. My husband and I have been together for 12 years, married for 6. We didn't move in together until we had been together for 2 years. We saw each other as much as possible, but it wasn't the same. An open relationship seemed like a good option. Do what you need to, be safe, and don't get your emotions tangled up in it. The only thing I asked was to know that it happened, or was happening to avoid any embarrassing situations, but I didn't want to know the details. It wasn't always easy, and there were misunderstandings and fights along the way. We've made it work. At first, I would leave the house, but after one time too many of being asked to leave the house without much notice I said enough of that. The comfort of his fuck buddy in my own house is not my problem. I'll go into the office or bedroom and do something else, but I will not leave the house for it. We do not take out play partners into our own bed. The guest room is fair game, but our bed is absolutely off-limits.
I mentioned before about being told it was happening to avoid embarrassing situations. The first thing most of us do when we get up is to look at our phones. He had someone over early one morning. I normally get up at 5:30, so I checked my phone, didn't see anything, then went to the bathroom and walked out to the kitchen to get coffee. I walked in on him getting plowed in the living room. I just stood there and laughed, then turned around the went back to bed. The other guy left and my husband was really embarrassed. I reminded him that if he had left me a text, I would have seen it and stayed in bed another 30 minutes or so.
You can make it work, but it requires clear communication and 100% honesty with each other. You also have to be honest with yourself. If something makes you uncomfortable speak up about it right then and there. If you let it ride, your silence becomes unspoken consent and it will happen again. Make a list if you have to and clearly define what is acceptable. Is bareback off-limits, but swallowing acceptable? Maybe neither is acceptable to you. I know some couples where only oral is ok, and others that have no limits at all. You won't know until you talk about it. What if one partner wants to explore some bisexual curiosity. Would you be ok with that? Never presume you are both on the same page until you talk about it. Miscommunication leads to misunderstandings. That leads to resentment and anger which will quickly ruin a relationship.