Odd or not?

This isn't a very professional point of view, but just a personal observation. And i may stand corrected, but here's the deal.

The East West Kitchen in Cyberia has a very specific demographic, be it those who eat in or take away. What I notice while sitting there was that the patrons of this particular joint consisted of :
- solo-ist (one person,alone)
- couples (one guy, one girl)
- single sex groups (all guys, all girls)

What's odd? It's very rare to find a group of mixed genders, for example, 2 guys one girl. And when there's a group of 3 or more, they're usually the same gender. I'm unsure what is it about this restaurant that renders the mini phenomenon.

The first time i noticed this, I assumed it was a one off coincidence. But frequent visits (even up till recently) have proven this to be the case. I find that the many other food places in that area do not encounter this situation. Mixed groups are common and a staple.

I'm not sure how I'd calculate this, but if you were to observe from lunchtime onward, the probability of a mixed gender group in there is ...a low 5%  chance?

My theory :
It's a quiet place where people who prefer not to mingle, or shy among the opposite sex find appropriate or comfortable. They are general  a quiet crowd, I would see how it would be ideal for a couple out for a quiet dinner.

Mind you, this behaviour, it's not exclusive to a specific race or age group. Students, working class... all alike. It's like a universal understanding between the many races and nationalities, be they Malaysian, Indonesian and the like.

Also, the reason as to why I manage to catch this is because, unlike me, the other customers are efficient. They're there to get a meal and that's it. They eat, they leave.I on the other hand sit there, for hours sometimes (but you don't need that long to see this).
Many times I myself am part of the demographic, either coming alone with another girl or guy.
Ever so rarely a whole bunch of us will meet up for dinner...therefore becoming the minority .

Prove me wrong, or find out for yourself :) Check it out if you happen to be in Cyberia.