Usually if its mixed then only one of the opposite sex has to be on the team that night. When I was the Captain of the Navy Varsity Team here in San Diego, we had the low man sits out. Getting the team to practice was no problem, the sixth person had to show up anyway in case something happened to another teammate, and if you rally want to bowl, you might concentrate on your bowling a little more then normal, and no Pchee2 sandbagging whiner. It'd be a Leftside left handed whiner.
V/R,
Nicanor