Merkin - the pubic toupee

In The Girl in the Glass, Declan and James escape the FBI by hiding out in the seedy underbelly of Washington, D.C. There, they learn about merkins, which is a pubic wig or hairpiece, typically made of human or synthetic hair, worn over the pubic area.

Historically, they were worn by prostitutes after shaving their pubic hair to eliminate lice or hide signs of sexually transmitted infections. Today, merkins are also used in film and theater for historical accuracy or as a costume element. They can also be worn as a fashion accessory.

Merkin salesman displaying the options

Merkins today. I assume this is a gag gift.