Is this odd or just normal in an office work environment?

[TheNameGames]

I suppose it doesn't matter, really, but to me it seems an odd set up but my colleagues seem indifferent and like it's not a big deal.

At work (office building) men's and women's toilets are designed exactly the same. Seven cubicles in a row, fully concealed from ceiling to floor, each cubicle lockable, if the lock is broken or the toilet is broken then the cubicle is locked from the outside and an 'out of order' sign is put on that singular door so nobody can get in until someone comes in to repair whatever the issue is and fixes it. Both designed exactly the same, no urinals in the men's.

But the cleaners that work there always operate that the male cleaners always clean the women's toilets and the female cleaners always clean the men's toilets several times a day, every day. Nothing dodgy or untoward has ever happened in the many years I've worked there AFAIK but I've always thought this odd. I mentioned it to colleagues over the years and they just didn't seem to think of it as odd. Is it normal? I'm not looking to complain or go to the managers or anything because we are of an office that has been working there for many years, as have the cleaners, without any issue, and we all get on but it just seems like an odd set up to me. Is this a normal practice? Does it happen in anybody else's workplace and is there a specific reason?

Have you asked the cleaners? In conversation, not necessarily confrontation? Maybe they have set areas to do.
I couldn’t get worked up about this- it’s quite usual to have mixed sex cleaners cleaning public areas.

@JuniperBeer
Have you asked the cleaners? In conversation, not necessarily confrontation? Maybe they have set areas to do.
I couldn’t get worked up about this- it’s quite usual to have mixed sex cleaners cleaning public areas.

I have. We sometimes have breaks and lunch at the same times and sit and talk together sometimes and I have asked but they don't have an answer and don't see it as an issue which is why I'm not (and wasn't planning to anyway) mention it to anyone 'higher up'. But I just found it a bit strange that there are two male and two female cleaners but they always, not mixing it up, clean the opposite sexes toilets, daily. I just wondered if there's a reason and if it happened anywhere else. Just curious more than anything else and wondered if there was a reason for it more than anything.

Tried to Google this. Someone mentioned the same thing about shopping centre toilets. But still none the wiser.
One thing I did come across was it meant that the cleaners couldn't attack the males but then that would only apply if the female toilets were cleaned by females also.

That is really really weird and a bit icky.

The lack of urinals not unusual, the male cleaners yes.