Anna was just very.... curious. Not so much in THAT kind of way, but just as a sexual being in general. She was still very naive about those kind of things.
"I didn't... wow. I didn't know these kind of books even, you know, existed! Not that there's anything WRONG with it! There's not! Just... you know... kiiiiinda surprised..." Hah! Yes, the princess was blushing. BADLY. She quickly handed the book back to Anna with an embarrassed smile. Luckily, Anna didn't bat an eyelash at Quinn's mention of a girlfriend. To Anna... love was love. While SHE was attracted to guys... she'd never judge anyone based on who they were attracted to.