Well, gender really -- but I got your attention. Here's a test to determine your levels of femininity/masculinity. It's from the BBC. I score run-of-the-mill feminine -- kind of a surprise since I anticipated coming in somewhere between Janet Reno and Mike Tyson.
There are some interesting links talking about the number of older brothers a person has as an influence on finger lengths, which is just weird and topical enough to interest my four brothers who are younger than Greg.