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Wingman is a role that a person may take when a friend needs support with approaching potential romantic partners.
This character (male or female) may be aware that he is used to advance the relationship between the two other characters because he has proposed it himself or because another character has asked him to render this service.
It may also be that he does not know that he is used for these purposes.
He is not necessarily sexually involved with the protagonist / hero / heroine he is helping.