my (20m) gf(20f) randomly did this during sex /u/Zestyclose-Fox1340 Sex

so like im not really sure how to react, I was thinking about it now I feel like kinda weird almost sad even. me and my gf were having sex and she randomly put a finger in my butthole, like I kinda got shocked cause it was so unexpected asked her what she was doing and she stopped. usually I ask her what she likes if im able to do it so idk I feel kinda weird she randomly put a finger in my butthole. am I like overreacting or something, im a guy I was wondering what a woman’s perspective is. I dont really have family to talk to. we spoke before about trying pegging, but I really dont want to do it I was just surprised she put a finger in my butt after

so like im not really sure how to react, I was thinking about it now I feel like kinda weird almost sad even. me and my gf were having sex and she randomly put a finger in my butthole, like I kinda got shocked cause it was so unexpected asked her what she was doing and she stopped. usually I ask her what she likes if im able to do it so idk I feel kinda weird she randomly put a finger in my butthole. am I like overreacting or something, im a guy I was wondering what a woman’s perspective is. I dont really have family to talk to. we spoke before about trying pegging, but I really dont want to do it I was just surprised she put a finger in my butt after