Am I wrong in being a bit uncomfortable about my girlfriend kissing other women for work?

Tonight, my girlfriend dropped a bomb on me (again :[ ) by asking if I was cool with her doing some ‘girl-on-girl’ action for work. Shocked I just kinda stammered and asked ‘wut’ to which she responded “My section is more of a thrill house, aka. lot of people just jumping out at you annnnd it’s theme is a vampire strip club there’s no nudity :P or anything like that but there’s an area where they wanted girl on girl stuff, barely touching or anything, but placed me in that area”
A bit concerned I asked what that would constitute of and she reply with “ugh, I’ll have them switch me” and later then was irritated with me the rest of the night saying she wasn’t ‘my type’ and that she was too wild for me and accusing me of not being happy in our relationship.
Not much was said by her after this and I’m just wondering if I’m just being an asshole by being uncomfortable about it. She said she didn’t know how far the ‘sexy acts’ would go and got mad that I would be uncomfortable with her kissing other people. I never said that she couldn’t do this position or anything of the sort; I was just looking to know exactly how far this was suppose to go. Additionally it was rather alienating because she’s always been rather modest before and she pretty much pulled the whole discussion out of the blue.

Syger: I’m just not comfortable with you kissing other people. But I don’t even know if you would be kissing them or not because the most detailed description I got was ‘something sexy with another girl but nothing truly sexual’
Significant Other: Even if it’s a girl that I’m not attracted to in the least?
Syger: yes

So anyway I’m confused on how I should feel, if I’m justified, and I’m really just looking for some outside opinion on the matter.
(Also incase you’ve been around for my other question, I haven’t gotten an update on the whole heart condition but she seems to be fine… aside from being irritated at me anyway.)