Sydney Opera House 

Sex Position, invented by kangaroos in the Land Down Under. You Have a partner receiving anal sex and having the mouth stuffed with another dick. The person giving the anal sex is in turn also receiving anal sex. Everybody participating must stand at different levels and angles thus looking like the Sydney Opera house. Bonus points if you have opera music in the background.

Bro 1:Hey man did you go to the orgy party at Steph's on Saturday?
Bro 2: Yea man Me and 3 other guys did the Sydney Opera House on that Hoe.
Bro 1: Hell yea bro.... wait a minute what guy analed the other guy?
Bro 2:.....

Sydney Opera House by tonyyayo4492 October 5, 2011

Sydney Opera House 

Much like the infamous "Eiffel Tower" sex position, the Sydney Opera House is similar, but incorporates an additional woman in the center facing the other while the two hook up. This position offers a wider base and more stability for the two bros on either end.

Bro 1: What'd you guys do last night?

Bro 2: We were at a party and got Kylie and Allegra drunk and Sydney Opera House'd those bitches!

Bro 1: No way bro!

Sydney Opera House by Gingerous Maximus November 25, 2011

The Sydney Opera House 

The sexual act of 1 person doggy-styling another person who is also doggy-styling who in turn is giving oral pleasure to another person.

(Popularised on Reddit in the post "Meanwhile In Australia...")

People involved: 4
Worth it: Most likely

Guy1: I did The Sydney Opera House last night.
Guy2: Oh, ok.

The Sydney Opera House by TheBigBadWolf90 October 5, 2011