To be honest, yeah I have. I've read things as intense as Yamane and Zaria's work on my phone out in public... with the straightest face. (Though I do turn my phone inward a little and glance around to see if anyone is peeking, haha).
Of course, I always do, everyone knows I read yaoi at school and at home, so I'll just fangirl with 0 f*cks given (*´∇`*) one of my religious friends hates it and saw me read hardcore smut once, I laughed so hard (・∀・) reply