My girlfriends female friend sent her nudes, her friend is bisexual. Is it normal?

So basically my girlfriend told me that her friend sent her her nudes out of nowhere. Her friend is bisexual and there are close but not that close. I honestly feel awkward with the whole situation and when I asked my girlfriend what she replied to her, she tried to excuse her, even tho I felt that my girlfriend was actually kinda uncomfortable with the situation too. What should I do?
My girlfriends female friend sent her nudes, her friend is bisexual. Is it normal?
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