480 players in top 30 of NRL squads - if you took any random 480 bloles between the age of 18 and 35, there'd be a huge number who have filmed and shared their encounters. I'm only just outside that age bracket and find it a bit weird (coz I'm getting old), but it's ridiculously common amongst those in their early 20's. So it's not an NRL specific problem.
That being said, it's a problem for the NRL. My view is that these videos should only be met with a punishment if they are made public without the consent of any individual involved. Whoever has shared it without consent will be subject to legal action, and if its the player who's done it, then the NRL can sanction them, if no complaint, then let it go - it could be argued its a sexual preference.