I found an old idol video online, BEV72-17 starring Tono Natsuko 遠野奈津子.
Holy cow, did they ever go batshit with the mosaic back than. While she has indeed taken her knickers off but she's using them to block the view so there's nothing to see, and yet...
I guess it got better with the later vids. BEV72-91 with Aoi Minori 葵みのり was quite fun to watch despite the low resolution. No pixels with the clever use of angles or just having something in the way. She is very cute and the video is decent quality for something so old.
BEV72-60 Aonuma Chiasa 青沼ちあさ. Pretty girl, again no pixels.
If anyone else has much more of these BEV72 titles, more would be welcome indeed. Its a nostalgic look at the past despite the crap quality and resolution. It does look like a time when the girls were just more natural.