First, I need to understand the main components. The Kamasutra is an ancient Indian text on relationships, love, and intimacy. The user wants it in Bengali, which is a regional language in India and Bangladesh. They want it in PDF format, which is common for documents, and they want it free. Also, there's a mention of "with photo" and "49 top." Maybe "49 top" refers to a specific section of the Kamasutra that has 49 illustrations or positions, similar to how some modern books categorize different positions.