Yes, there's no real difference between urine and "love juices." If you're okay with the liquid coming out of Ibuki, why wouldn't you be okay with Kotone's urine? What about the saliva? Heck, they're all bodily liquids. What's the big deal?
Urine is a distinct sort of warm, urine has nil consistency, and above all, it has a scent that is likely not associated with teh secks on the whole. It's a waste product, and not prominently purposed for amorous activity.