I once was in bed with an overweight girl, she was more than a bit overweight but she was really sexy and knew what she was doing. anyway, I told her how sexy she was and while she was basking in the compliment I said "you probably don't hear that too often" I felt like an asshole for a week after that. I didn't say it on purpose to hurt her, I am just an honest person and I was sure she did not hear that too often but it was fukin tactless of me to voice my thoughts.
needless to say she was pretty pissed off at me.