One hour long and one guest for each year of age are good rules if you want everyone to have a good time. There is a new awareness of the sexes during the preschool period. While parents will want to set limits on this play, they need not be upset about it. Around five, many boys refuse to use women's rest rooms, causing some inconvenience for their mothers. Little boys may talk of marrying their mothers or sisters or girls they know.
Girls do the same with fathers, brothers, and boys.
Aggressive children need large amounts of tolerance and open space. Contrary to the opinion of some, aggressive children are not necessarily hit by their parents or encouraged to hit others any more than nonaggressive children are. Still, you do not take this type of child to a china shop. These are children who grasp life rather impulsively, without a lot of forethought about the consequences. Constant setting of limits may not be effective with this type of child at this age.