:| when we was having , she was complaining saying it was too big and hurting her...?

all are made in equalli depth, ur gf should not be complaining, seduce her as much as u can and let her get extra excited when u do have , dont put it all in her, go slowly and make her feel horny, i dont know dirty talks or whatever, cz it will excite her more and release more fluid where she can open up more, then u can start doing it from there, if she still wants to be on the vibrator, then thats reali a pity, just try what i said before..