When we were younger, hearing our friends curse for the first time and realizing we could do the same was liberating.
It opened us up to a whole new world where we could actually express ourselves using those same "dirty" words that would make our moms break out the special soap if they heard us using them.
For most of us, our own desire for cussing probably waned as we got older, but that's not to say our friends' did. And I'm fairly certain we all still have at least one pal who's maintained their colorful vocabulary well into adulthood.