<human>: My partner and i have been dating since early November, it has everything a normal relationship has, the dates, the sex, and we're happy, but for one thing. we have always referred to each other as adventure buddies rather than Boyfriend/Girlfriend because she is very sensitive about the word and says she isn't ready for a "relationship" in that sense though we are in every other sense.

The title doesn't matter that much to me as long as were happy but she gets upset when i mention the above. 

Now to the darker side, i believe she has been raped or sexually assaulted in the past by someone she called boyfriend or was someone who was very close to her. I believe this because 
* she is very uncomfortable with Rape/sexual assault when it is discussed around her such as becoming distraught and running out of movies that present scenes of such content. 
* She ( a very avid reader who usually reads anything i give to her with words on a page) gets very uncomfortable when i mention one of my favorite books that has recurring sexual assault in it (girl with the dragon tattoo).
*  Lastly i mentioned to her some fetish play such as "rape" sex or bondage and she gets very uncomfortable and tells me that's fucked up.

She has said she isn't comfortable with a BF/GF relationship and that's because of something that happened in the past. i try to understand her and I'm happy with or without a title. But how do i talk to her about her past without hurting her. i cant just ask her "hey have you been raped?"

Could you distill the essence of the text into 1-3 sentences?
<bot>: I suspect my partner has been raped in the past and it places tension on our relationship when i talk about calling ourselves BF/GF.How do i talk to her about this?