Throwing a bull$hit flag on that one. Beer tents yes, sex tents WTH? Must have been back during the Civil War. Now I will point out that during a certain War occurring in the last millennium, being the first war with a large population of female military personnel, prostitution did occur in military tents by military members. But, that was severely punished if caught. It certainly was not sanctioned by the military.
Hell, they actually tried to discourage sex with lectures and graphic pictures describing the black clap and how certain body parts can rot and fall off.