>>4688 (checked)
This is correct, but I will attempt to be a little more specific.
>>4686
I'm male, but I have input on this, because I have personal experience with this sort of thing, experience on what not to do:
First off: Open your ears to her first, before you expect hers to be open to you.
The stability of the relationship is first and foremost. Realize that this is just "extra" stuff that you want, not that you need, or that she is obligated to provide. Think hard - is there anything that she has told you, any hints at all that she has dropped over the years, say, while watching a romcom or something, "Oh, when I was little I used to dream about being carried in through the front door back to the bedroom…" ANYthing like that which you may be overlooking.
Secondly: Remember the #1 rule of relationships.
Communication. Are you communicating through sex in a healthy way currently? Mostly rhetorical question, but one that must be asked. Attempting, even just asking, for more without being ready and willing to give something more can be offensive and inconsiderate.
Think about it: Imagine if your gf was out of shape, and then one day she asked you out of the blue, "Hey, I have a fetish for really strong backs, do you think you could start working out for me?"
Where did your feelings, your lifestyle, your schedule enter the picture? She didn't communicate that she had ever considered them, and that's just rude. If she gets negative feedback from you after asking that question, it may close off her willingness to come forward about other desires she has in the future - not good! What would be much healthier/more cooperative would have been, "I'm thinking about starting to exercise to make myself more attractive to you. Would you like to exercise together? I have a fetish for strong backs." I'm sure you'd be much more receptive hearing something like that, so be the kind of partner you want to have.
Third: This brings to Rule #2, compromise.
If she has a request of you, you'd better be willing to do it.