Reddit mentions of Gaga Feminism: Sex, Gender, and the End of Normal (Queer Ideas/Queer Action)

Concerning introductory books, I'm better versed in German literature, but here are two books that might suit you:

• Laurie Penny: "Meat Market"; A quick and easy read, that gives a nice introduction to objectification and marketing of female bodies.
  
• Mimi Marinucci: "Feminism is Queer"; A short introduction to queer feminism, the intersection between feminism and queer theory. A bit more scholarly but still an accessible read.
  
  And just in case you can read German, I would heavily encourage you to read:
  
  
• Julia Korbik: "Stand Up"; A very comprehensive, accessible and furthermore damn pretty book about not only feminist thought, but also practical feminism.
  
  If you want a "real" scholarly book, there is incredibly much I could recommend. So if you have a specific area of interest, just ask.
  
  Personally I'd recommend most books by Judith/Jack Halberstam, I find them to be decently accessible, very relevant to both recent feminism as well as gender theory and with a heavy connection to pop culture, which makes them rather engaging.
  
  His/her most recent book, might be non-scholarly enough for you. In any case, I would heavily recommend it:
  
  
• Judith/Jack Halberstam: "Gaga Feminism"; An engaging view on pop culture and its interaction with queer narratives, before the backdrop of mainstream society.
  
  I hope that gives you a decent starting point.