I was accidentally seen naked by my girlfriend’s relative—how do I prove it wasn’t on purpose?

Hello, I got caught naked by a family member of my girlfriend and ahe thinks I did that on purpose. How to convince her? Should I tell her because I have a very small penis I would not want someone to see it? Will that be enough?
I was accidentally seen naked by my girlfriend’s relative—how do I prove it wasn’t on purpose?
Post Opinion