Most beginners want to be able to have both feet flat on the ground while sitting on the saddle. They also end up pedalling with the arches of their feet. (I've always wondered why unicyclists in circuses pedal with their arches.) I don't know about the rest of you, but I learned to ride as a kid on a borrowed adult ladies bike. I know kids who learned on mens bikes by stepping through the frame. There is no way we could even sit on the seat, let alone put our feet on the grownd while seated. I guess by the time one is 25 years old, learning to ride a bike and falling off would be a lot more difficult and embarassing that it would be for a kid, same as learning to dance or swim.