I was flying with an instructor on my Biannual (Biennial) flight and as I turned to line up I made a right turn on the runway.
He then asked if I was left-handed, and when I said I was he said that given a choice, left-handers tended to have a preference for a right turn.
Not scientific, not always the case and I won't defend this comment but generally I've found it is true.
As with IFMU, when I'm gliding, I use the clues to turn either way for thermalling, but if its a 50-50 call I'll probably turn right 80% of the time.