Green’s Dictionary of Slang

1. the vagina.

1661

‘Peter Aretine’ Strange Newes 3: Wand. Wh—. I [...] spread my imperfect Limbs [...] claping my hand on my market-place, and saying, here’s your Ware boys, which invitation with a wink, a smile and a chuck under the Chin, brings in the bonny Lads.

2. (US) that area of a city or town where street prostitutes work.

1965		C. Brown Manchild in the Promised Land (1969) 200: When a chick’s habit came down on her, she’d usually end up down in the ‘marketplace’, 125th Street between Third Avenue and St. Nicholas Avenue.
1981		(con. 1720s) J. Weeks ‘Inverts, Perverts, and Mary-Annes’ in Journal Homosexuality (1980/81) 6 Fall/Winter 120: The metropolitan subculture of Molly houses, pubs, fields, walks, squares, and lavatories. As early as 1720s, these meeting places had been known as ‘markets’.