Hi, always anonymous... whenever I'm having sex with my girlfr | TEENSHOODgh

Hi, always anonymous...
whenever I'm having sex with my girlfriend she forces me too put it her anal too..I told her I'm not comfortable with that,but she also told me it makes her achieve her orgasm very well....but I I knew this is wrong. Even though she's realized that I don't like it, whenever we're having sex,she slides it in her anal again...and I fucked it for her.... I'm afraid she might get some complications in her anal but it seems she enjoys it too... sometimes I ask myself is there any feelings in the anal of some ladies pls help me and how to make her stop that