Contents Introduction: What Urbanization Brings to the City ..................................................................................... 1 Understanding Gay Urban Spaces in 20th Century........................................................................................ 3 Coping with the Early 21st Centuries’ Gay Urban Physical and Virtual Spaces ........................................... 6 Gay Urban Scale Economies ....................................................................................................................... 11 The Amplification of the HIV Epidemic by Gay Urban Spaces ................................................................. 12 Examining the Nature of the Gay Urban Spaces..................................................................................... 12 Examining the Nature of the Sexually-Active Gay Urban Dwellers ...................................................... 16 Conclusion: What City Brings to Gay Dwellers ......................................................................................... 17 Bibliography ................................................................................................................................................ 19