Guy101 saidHow any dude doesn't know what a tampon and what its purpose is hilarious. Maybe I'm just special since I have sisters and a mom. Lol.
I also had a sister and a mother, but I definitely did not learn about such things at home.
I also have a sister and a mother and wasn't taught at home, but still I knew about those things ages ago.
Back when I was in grade six, they taught these kinds of things to boys and girls. This was a catholic school too for crying out loud so nobody else has an excuse.
Seriously though it's not hard. If in today's age a guy doesn't know women menstruate then they surely have been living in a cave. If they know that basic fact, then surely it's not hard to piece together how one may use certain products to deal with that. I mean, it's not like you have to have too much creativity to at least guess how it may work.