not to contradict (cause i ain't no sexpert) but i thought it was when three people have sex in the way you described, doesn't have to be two boys and a girl, they just all have to be willing.

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Trees give peace to the souls of men * Nora Waln

The forest would be very quiet if no other birds sang than those who sing the best * Henry van Dyke

some fairly sordid tales, rambles, and anecdotes
Hypothetically Speaking * Something More * Cammy Interrupted * An Experimental Vacation * Masked * so..damn..hot * Thank You * My toy, his idea * no.19 Maple Lane * I Have A Surprise For You * Yesterday * In a Quiet Kitchen * help me decide * untitled prose * more untitled prose