Serious answer:
Opening up BSA (the program formerly known as Boy Scouts of America) to girls did not make the 12-18 year old scouting program co-ed. Boys still meet and camp by themselves with adult male leaders and so do the girls with adult female leaders. This move was all about giving girls a greater outdoor experience and, of course, increasing its membership.
The BSA leadership felt that the 'separate but equal' approach was necessary because 12-18 year old boys and girls tend to mature at different levels and maintaining the boys-only model allowed boys to assume leadership positions in their troop that they might not otherwise get in a co-ed environment. Of course, in the girls-only troops, the girls are also able to assume leadership positions plus get involved in activities like hunting, fishing, archery, hiking, camping out, etc.