I am not a mud expert myself and I collected all the data that was passed onto me by Rob Blaine. This is a curious omission that was not in my database and thus was not in Rob's lists either, so for some reason we both missed this movie from 1981. I just looked at a high res version of the 1981 film "Goin' All the Way" and I had not seen this mud scene before. Doubtless Regis and the mud experts already know this scene, but somehow I missed this one. There is a low quality VHS rip of the film on Youtube which I refer to below. But checkout the new high res version that is now available on some streaming sites and download sites.
MK
ps...note that Youtube have recently changed their system and now age restricts millions of videos that were previously unrestricted, and now will not let age restricted videos from being imbedded and viewed outside of Youtube. Err...somebody please explain to me why it is not OK to view adult themed media from outside of Youtube but it is perfectly OK to view that same media from inside of Youtube. Call me cynical, but I see no valid reason for this other than Youtube wants more people to visit their own site and not to view videos from external embeds from blogs and forums -- go figure. It is also a cynical move by Youtube because now that they classify millions of old videos as age restricted, this automatically makes those videos ineligible for monetization because age restricted videos are barred from Google Adsense....so this is a money grab by Youtube with these new changes because they can now get an audience and none of those channel owners can get paid etc so Youtube gets to stream the media without compensating the channel owners. FYI Youtube have now re-classified approx 50% of the videos I have in my Youtube channel....so age restricting does nothing to protect minors on Youtube, because they can still click and watch those videos. It is being used merely as a device to demonetize Youtube channel owners....neat trick.