Boyfriend wants me to fuck another guy

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Just posting this for open conversation, not necessarily advice (although it’s welcome). My boyfriend brought this up to me and I thought it was a joke. He was turned on and said he wants me to fuck another guy or that I could, as long as he knew I was doing it. I was like, doesn’t it make you angry to think of another guy doing that?! He said as long as it isn’t behind his back. He also wants to have threesomes (both ways). I am kind of turned onto the idea, but a little worried anyways because of STDs/pregnancy and I am socially awkward sometimes 😂 I told him that there is no way in a million years that I would be okay with him touching another girl (unless it’s in a threesome) and that he is not allowed to fuck her. He said he’s okay with that and understands it.