Seriously.
She opens cabinet doors and then goes spelunking, looking for viable toy options such as these enticing feminine products. Apparently, they are very interesting to the 18-month-old set. I know this because two of these gems kept Natalie occupied for at least 10 minutes and when the guilt took over and I took them away, I had to deal with a full-scale meltdown.
Aside from the fact that their textbook use is kind of gross, they aren't choking hazards, they're not sharp, and mine are made with natural materials. Additionally, tampons are sterile and that is more than I can say for her other toys, which are far more expensive.
So tampons--you get an A+ in my book.