What is the most contagious STD?

I was quite shocked that crabs (AKA pubic lice) is as prevalent as it is. But in the past week I have been asked about it three different times from people all over the US, which made me think that this topic needed a little discussion related to what crabs are, how you get them, and how to treat them.  I wasn’t sure how prevalent they are, but they are clearly around, and infections are on the rise....more