I agree that there is nothing wrong with that. We are grown men enjoying each other.
I have one good buddy, that is very regular , hes been married, now has a GF, but loves getting together with me, so we can enjoy some hot mansex. We are vers, so it goes both ways there. As I said, very enjoyable.I also see another guy fairly regularly, hes all bottom, another enjoyable connection.
Its all good as long as we enjoy, and its mutual.
I feel like this is slut behavior, but that is definitely not a bad thing. Being a slut, I feel, is broad. If you reserve yourself for friends or hookup with anyone who's willing, you're still enjoying sex freely and openly; which is what I would consider being a slut. There's nothing wrong with it, just keep doing what you're doing and use slut as a word of power for yourself!