CNN  —  Last year, French photographer François Prost spent hours browsing Google Maps to plan a road trip documenting Japan’s “love hotels” — establishments found across the country that offer hourly rates and, most importantly for guests, privacy. But as he embarked on his 3,000-kilometer (1,864-mile) journey, they proved impossible to miss. While some featured heart or lip-themed signage (or names like Hotel Passion, Hotel Joy or Hotel BabyKiss, to use a few examples from his trip), the