Did u ask her why she thinks it would ruin your relationship? Might be her way of saying that if she does try BBC she might like it so much that sex with you wouldnt be fun anymore?? I wonder the same thing sometimes if my gf tried it. I already know she loves big thick cocks shes never tried a BBC either but I do think that once she had one she would crave it from then on. Even how much she likes my cock i still think she should try fucking a BBC...you only live once!
