Girlfriend just likes one thing.
My girlfriend and I both understand what we like and are pretty open with how we feel. But when we have sex, I usually initiate and it leads to me performing oral sex, then straight to her on top. is it normal to want the favor returned once in a while, or to want to try new things? (side note, we have been together over two years, and when I express these ideas, she claims she has never done anything like that before and that is the end of the conversation.)