trading skins 

Two straight men engaging in mutual masturbation.

Dude, me and Ted got so drunk and horned up last night we ended up trading skins.

trading skins by The Brat October 13, 2006

Trading Beaver Skins 

An 18th Century version of wife swapping.

Mostly used between American frontiersmen, and in some cases, englishmen with ties to American trading.

Chap 1: I say, Rufus, how would you feel about heading to the cabin and trading beaver skins this night?

Chap 2: Ahhh, splendid idea, Worthington!

Trading Beaver Skins by JesseLikesFood November 17, 2011