Girls could and did play marbles and skulley-- but these were boys games ( jump rope and jacks were girls sport)

by HS--soft ball as co-ed but baseball (hardball) was male-- Touch football the boys liked to be co-ed-- they like the touch part.
mumbley peg was definate still a boys game in the 50's and 60's-- I started carrying a knife at age 13-- i wasn't a tough kid-- but i found it usefull (i still carry a "swiss army" type knife) but would never think to play mumbley peg.

Everyone played ringalevio, nowdays most kids have never even heard of it!

Last month NYTimes reported on world championship Double Dutch contest (held in Harlem) winner were a co-ed team from Japan- most US teams are still all female.