I think it does to some extent. My brother and I grew up playing on our bikes, we were reckless, we wanted to be stuntmen when we grew up and we fell off loads, but that didn't matter, we simply had loads of fun on our bikes. My brother became a father and insisted that his kids wore helmets whenever they used their bikes and they seldom use them (the bikes). My sister on the other hand doesn't have an issue with her daughters riding their bikes sans helmet and the girls often play on their bikes... of course this is just my family and just my observation, so will likely be dismissed as an irrelevant anecdote.