The only "candy" used as an accessory during the performing of oral sex. Hall's Mentholyptus cough drops also work. For a woman showering will be required afterwards unless your a really big fan of yeast infections.
If you really want to give a girl a treat eat her out with pop rocks in your mouth.
When a pair of people are having extreme difficulty performing a task. Usually due to the complexity or physical effort of the task involved. Or the inability to get their efforts coordinated enough to complete the task.
Did you see those two trying to get that riding lawnmower off of that pickup truck? They looked like two monkeys fucking a football.