I'm fine with a partner whether it's shaved or not. For testicular hair, I prefer natural or trimmed to shaven, but only by a small margin. If I've got a partner who wants to be rimmed, my preference might balance a little more closely, so that I'd truly not have a preference shaven or unshaven.
I make this sound all statistical... most partners I've had will mix things up over the course of a relationship, so testicular I prefer natural more often than not, and for an anal-receiving partner I prefer an even split of the time. Does that make sense?