Does it ever bother you to think of how many STDs you might have been exposed to?

My boyfriend and I were both virgins when we met and we've been faithful to each other in the three years we've been together. So I feel rather superior to my friends. Most of them have had at least two partners. But what I find amazing is how few ual partners it takes to expose oneself potentially to hundreds of other people and their ghastly germs.