Big Sister was a voyeuristic pay site, located in Prague, Czech Republic. Operating from 2005 to 2010, it described itself as the only brothel where customers could use the women's services for free, subsidized by paying Internet viewers; live video and audio streams and archived videos of the activity in the brothel were available on the website for a fee. These subscription fees, as well as sales of DVDs of the recorded action, represent the company's main source of income.