Under the dim glow of the Berlin metro lights, two gay men, one a seasoned local and the other a wide-eyed visitor, lock eyes. The local, bold and confident, mouths "Gosto ver" - I like to watch - to the tourist, who, feeling a spark of excitement, follows him to a secluded spot. The local, his German accent thick with desire, asks, "Wanna show me what you've got?" as he unzips his pants, revealing his throbbing cock, eager to see what the tourist can do.