Why would my gf get mad at me when i ?

she gets mad at me when i to a playboy magazine as JUST a tool because she never turns me on, on purpose and i don't want to do anything thatll get her prego frm her so i just tell her to leave me alone with my buisness because she told me she has no interest in dirty flirting or seducing me. its hard to get off from her when i cant imagine her doin anything seductive, weve been dating for 9 months. love her to death, yet she doesnt fulfill THOSE needs so i just go to the BR and i will nvr cheat on her. were both 17. should she be pissed at me?