It was many years ago when I had YFs. But even then, I remember one time when I took my YF with me to pick up a sofa I had bought from an ad in the paper. My YF told me later with a laugh that the woman who sold me the chair had warned him to be careful once she found out that he wasn't related to me. These days there is even more paranoia. But I still think most peaople tend to think the better of people, especially ones they know. And since you don't fit the media stereotype of a pedophile, your friends probably won't be suspicious.

My advice would be to just go about your business without regard to what others may think. If you start worrying about how things might "look" it's more likely you will come across as "uneasy" with your relationship with your YF. This could be interpreted that you have something to hide. There's no need to go out of your way to explain your friendship, but don't be evasive either. Since nothing bad is going on, act that way and most will take your friendship at its face value.

Dakota