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Girlfriend sleepover

So my gf recently confessed to being attracted to girls, I have nothing wrong with that, fair enough.

One of her other friends is close to her and also says she bisexual. Along with all her other friends they're planning on going away for a week.

What I have a problem with is my gf tells me that her friend keeps touching her, my girlfriend just says its just stuff girls do, like walking past and grabbing their as$/b00bs & they both willingly have made "jokes" about having sex together. I trust my gf saying she would never do anything with her, but seriously?

Next thing my gf says shes sharing a bed with her when they're going away.

I just have a problem with that she entertains this behaviour & if i was flirting and joking about any sex with anyone she would hate it, as well as getting felt up. She does not see a problem with it. But I trust her fully she wouldn't cheat.

Am I wrong to be annoyed?