The Happy Hooker (1975)

Having emigrated to New York and immediately got the kiss-off from her mother-besotted fiance, a Dutch lass takes a well-paid office job and starts liberally sampling the local male talent. After a while she decides to make her pleasure her business too, and as her reputation grows she graduates to a high-class bordello. Soon she realises she has the right talents to make a real success of a place of her own.