A childhood belief about condoms

When I was very little I heard the word condom used. My mom had explained to me that if married people didn't want to have children they had to use a condom. The closest word I had ever heard to it was the word condiment so I figured condom was just an abreviation. Well one day there was a bit of a family gathering at my house, including my cousin who had just recently gotten married. Well she was discussing with my mom and some of my other relatives that she didn't want to have children. So trying to help my cousin I ran into the kitchen and grabbed the mustard, I ran back put the mustard in her hands and said "You have to use a condom like this if you don't want kids". EVERYONE laughed forever!!! and now I'm married and just had my first child. I had my cousin over a few weeks back (which is what reminded me of the story), She had brought me gift, I told her how thoughtful it was, and after I unwrapped it.....yeah Mustard. She then said "now you said you didn't want another for a while so use this wisely".