[quote=@Vilageidiotx]
<Snipped quote by The Nexerus>

Any one of these will do. 

[img]https://s-media-cache-ak0.pinimg.com/736x/23/39/f4/2339f41a39d66c0c82df773779492a42.jpg[/img]
[/quote]

On a serious note there is the Cobo Center and the Renn Center.

If you're going to draw dicks on walls then it would be fitting on the city hall.

There's also a big metal statue of a clenched fist hanging like a battering ram. You could use that as a prop for lewd fistings if you get the perspective right.