It sounds to me like you might be setting yourself up to get hurt. Someone getting too attached, or strife forming because a small amounts of jealously, could end up being a problem.
I personally would never do this because the possibility of something bad happening always arises when two girls like, or are in competition for the attention for the same guy, or vise versa.
It does sound like a lot of fun, but is something I would never personally choose to do. My husband and I don't share. What is between us is sacred, and no extra fun is worth sacrificing or risking changing that.
If I weren’t in a committed relationship, things might be different, but I still think the potential for someone getting hurt is there. I agree that it really does depend on your maturity levels, and how rationally you handle being in the situation. Knowing all the potential outcomes, before starting the relationship would help. Make sure you set healthy boundaries with each other, and always be straightforward with one another.
Be Careful.
