Two thoughts coming from two different directions, but both based on my own experience:
1. I was asked to wear the arm padding one time and let a trained dog grab my arm. I knew I was protected, but it was still scary. Anyone who cared deeply about me might have freaked watching the dog go for my arm. Your boyfriends may have not been able to own up to worrying about your safety, and substituted other concerns to maintain their masculine atitudes.
2. My wife had a couple of very provocative outfits. I loved seeing her in them, but it felt weird to share so much of her with the public. I guess if I was responding so strongly to how she looked, I was wondering how other men could not respond just as strongly. It wasn't that I was insecure, it just seemed unnecessary for her to be turning all of the men's heads when she was happily married... jeez, that does sound insecure! I guess I was having an instinctual response that my mind couldn't quite intellectualize away. Anyway, it was rather fun to see how much people liked to look at her dressed that way, but I had to seriously fight down the objections I wanted to voice before we ever left the house.