Wow, these are the hard questions first thing in the morning!

I think the "sexually active" question reflects whether or not people are partnered: I am partnered and you are partnered, so I assume we're having similar amounts of sex, whereas I assume that the single people on my flist are having little or no sex. Which is, of course, a pretty poor assumption to make.

The attractive thing is tricky. Veerrrrry tricky.