Ashley Butterfield, 31, has been around the world - but a visit to India brought home the particular challenges of being a lone black female tourist. "Are blacks better in bed because of genetics or diet?" the middle-aged Indian restaurant owner asked me earnestly as I finished the dinner he had prepared. Although not a question that one typically expects when requesting the bill, I was not unsettled. Having worked in international development for the past seven years and having travelled in 30 countries, mostly alone, I have grown accustomed to hearing things that most people would find jarring. However, I didn't feel defiant, upset or even threatened by him. This was not the first time I'd experienced this sort of thing. Once I fell asleep on a bus in north India and woke up to a man, inches away from me, videoing me on his phone. "What are you doing?" I asked, alarmed. He simply replied: "Instagram." In Udaipur, a man approached m...