Soooo… Correct me if I'm wrong, but afaik you don't need to kiss someone to know if you like their gender. To figure out if you like that individual person, maybe? I would try and have a serious conversation about it with her. Don't bend your values to make her happy here – If she wants to kiss a girl, she'll do it, with or without your permission. :/ You might be able to talk things through, though.
If it was a one time thing I’d say you’re over reacting but after reading this I feel like you’re under reacting.
You're somehow the only sane person here.
Soooo… Correct me if I'm wrong, but afaik you don't need to kiss someone to know if you like their gender. To figure out if you like that individual person, maybe? I would try and have a serious conversation about it with her. Don't bend your values to make her happy here – If she wants to kiss a girl, she'll do it, with or without your permission. :/ You might be able to talk things through, though.