Periods are not like the Common Cold.

I was going out to lunch with my two daughters, and I happen to have my period. My eldest daughter said that she was going to stay away from me and not sit next to me at lunch. What? Why not? Well, she thought she could 'catch', or get, my period. We laughed, as I told to her that that was not possible. She thought she heard you could. I explained about girls living together getting on the same cycle, but not just catching it randomly while out to lunch!