The 6th month suck is an ancient druid tradition going back hundreds of years and must be upheld to honour the faith of all the druids that perished in the dark wars.
It can only be used by couples that are in a relationship. And on the day of the the six months they have been together the female must honour the druids tradition. The male will say to his spouse it is time for you to perform the 6th month suck. At this point the female must then suck the man's penis for no less than half and hour until the druids that have passed have been remembered and the swallowing of the ancient druid juice shall empower the relationship for years to come.