I play in an indoor co-ed soccer league, the "problem" is that there are usually two team locker rooms at these small indoor complexes, but one open shower between the locker rooms.
Sometimes they split the locker rooms by sex, sometimes by team, either way you are naked in front of both teams, guys and gals, in the shower.
I will say that my current team is a lot closer to each other then my old team that played closer to work, further from home and in larger sports complexes with dedicated men's and women's locker rooms and facilities.