When I was younger I had a friend that had nightime incotinence and his parents always asked if I'd wear a diaper too so he didn't feel singled out. I always wore one when I spent the night at his place or he at mine and the many times we went camping. It was never forced and I did it because I cared about my friend and his feelings. I find it funny that my best friend was incont as a child and I wasn't but as adults I am and he isn't anymore.