A young Aussie joins the navy. On the day he is about to go to sea, his father warned him to be aware of gay sailors.

"But dad, how will I know?"

"Trust me son, you will know."

After 6 months at sea, the ship comes into port. The father was on the dock waiting for his son.
The son, seeing his father, got off the ship and shook his fathers hand. "Well son, how did it go?"

"Dad, I found out what you meant about gay sailors. One night I was out on deck all alone when a man came by and put his hand on my shoulder so I threw him overboard."

"But how could you tell he was gay?"

"Well, for 3 days he swam behind the boat yelling 'Throw me a buoy! Throw me a buoy!'"