In almost all circumstances a deep throat is better than a boat. Unless you’re using a boat to make a deep throat... Maybe the undulation would help. Imagine one standing on his feet and the other giving head. It would be a hard challenge to keep the balance while the one that stands on his feet grabs the other one’s head to make that fast come and go movement… Of course beer, heroin or previous fuck won’t help. Feel free to try and beware of the giant octopuses.