That 70s show too much to bare

There is a couple on the wrong side of 70 renting on our ground level who don’t use the blinds in their common-property-facing-kitchen at all, ever, night or day. Three households can clearly see in from their own places without really trying and six households cant miss them as we come and go via the stairs and halls.

Broadly speaking they are clean and tidy, however we see them both in PJs and nighties and smalls; him with no top on is quite a sight but the sight of a 70 year old woman in her leotard is not for the fainthearted.

They also leave their front door open a lot, not just for the breeze, but so they can stickybeak.

Most residents are embarrassed (or something) by all this and having to share their domestics with them. The sense is, the tone and so value of the building is lowered. The other day a fellow owner used the term ‘trailer park mentality’. Is there anything that might be done to suggest they might behave with a bit more dignity?