Okay, I've been thinking and I think I've thought of a suitable answer... Let's begin with the electromagnetic force. The photon is its intermediary particle, which means that the electromagnetic force is carried by the photon. The photon is not affected by the electromagnetic force like matter is. The graviton is the intermediary particle for the gravitational force. It carries the gravitational force. Therefore, just as the photon is not affected by the electromagnetic force, the graviton is not affected by the gravitational force. This means that a graviton would have no trouble with black holes or other massive objects.
__________________________________________________
A thought just hit me. Assuming the above is correct (which makes sense to me, if it deosn't to you, let me know so I can rethink this), if the photon is affected by the gravitational force (as evidenced by black holoes) then what if gravitons are affected by the electromagnetic force? This is also assuming that gravitons exist... (although string theory predicts them, we as-of-yet have not observed any).
__________________________________________________
Also, does anybody know if the strong force has any effect on photons or gravitons? I forgot what the intermediary particle for the strong force is, but is it affected by the electromagnetic force or the gravitational force? I neglected to mention the weak force because I am still reading about it and its apparent marriage with the electromagnetic force....
__________________________________________________

Any questions? comments? suggestions? I'd appreciate anything and everything - especially on the second part... that is very intriguing...