What is the thought over the years as to why the military did not, does not mix men and women in the same barracks?

Let's assume for a minute a reason could be to avoid sexual (guy and gal) encounters....good....bad....consensual....other.

Since it will be openly OK for same sex opportunities to occur in the military....should they not also allow men and women in the same barracks.

I sorta think when these "restrictions" were put in place it was to eliminate sexual encounters.......

so now what?

btk