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A minority group for those who find strength in numbers.
In the UK alone, there are thought to be several thousand enthusiasts.
Nor is it swinging or adultery; polyamorists aren't into cheating or one-night wife-swaps.
It also differs from the hippie notion of "free love", which was primarily about enjoying sex.
"It's an inclusive, activist community which sees beyond the divide between male and female, hetero and homo," says Samuelson, a 27-year-old postgraduate student from Brighton.
"When you start exploring your gender, you may also start exploring your sexuality," adds David, a 26-year-old musician who identifies himself as transgender, and feels that there is less acceptance of polyamory in more conventional gay circles.