a crotch wig for both men and women and is usually worn on the outside
a not-to-be-worn-on-the-head wig for those ladies who wish for a little more hair 'down there' Don't know what sort of styles/colours are available but I'm sure there are many
a pubic 'wig' used by prostitutes
a wig for a woman's "swimsuit area"
a wig of pubic hair for those who are lacking in that area
A merkin (first use, according to the OED, 1617) is a pubic wig, worn by prostitutes after shaving their genitalia to eliminate lice or to disguise the marks of syphilis. There are many different ways of wearing a merkin, although most involve placing the merkin on the vulva or the scrotum.
