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Similar to friends with benefits. A Shagmate will have no issue in sleeping with their own friends. They do it simply when the moment presents itself without any thought of romantic attachment. Don't get drunk with a Shagmate.

Fellow Shagmates enjoy each other's company but very rarely admit to being a Shagmate.
Person 1:"Did you hear Susi and Kyle slept together last night?"

Person 2:"But Kyles a textbook Shagmate."

Person 1:"So's Susi apparently."

Person 2:"Goddam!"
by Vai Baggio August 16, 2016
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