In my experience, they do. The wires seem to tug them out a bit.
Yes - the cord not pulling is huge. For someone who's ears are clearly differently shaped, the Beats 1 version comes with several different size attachments for the earbuds.
Tim Cook commented on an interview that the wires were a major reason as to why they fall out of the users year due to the weight of the cords. After testing this, I completely agree with him. You don't think much about it, until it actually happens. The AirPods help rectify this issue partially and then of course is the appropriate fit for the user being the other half.