==MongoDB==

Targets = {
    Age:23
    Sex:'M'
    Location:(10,30)
    Videos: [{V_id:Object_id(....),Score:1200},{V_id:Object_id(...),Score1110}]
}

==Django==

class Content(Document):
    ContentProvider = ReferenceField(ContentProvider)
    Title = StringField('Title',required = True)
    Description = StringField('Description')
    Link = StringField('Link')

class Target(Document):
    Age = IntField('Age')
    Gender = BooleanField('Gender',choices={'M','F'})
    Videos = SortedListField(ReferenceField(Content))