Absolutely. There are the cat woman SP's {some of whom post here}, plumber SP's, cleaning lady SP's, PC SP's, and hundreds more. While your plumber may offer free sex to a housewife, it cannot be expected. The same goes for well over 99% of SP's out there, whether in Vancouver, Thailand, Siberia or Timbucktwo. Sexual intercourse being offered, let alone given, is not the norm.
"A service provider is an entity that provides services to other entities. Usually this refers to a business that provides subscription or web service to other businesses or individuals. Examples of these services include Internet access, Mobile phone operator, and web application hosting. The term is more often applied to communication services than to other kinds of service industry."
http://en.wikipedia.org/wiki/Service_provider
"Service providers face obstacles selling services that goods-sellers rarely face. Services are not tangible, making it difficult for potential customers to understand what they will receive and what value it will hold for them. Indeed some, such as consultants and providers of investment services, offer no guarantees of the value for price paid.
"Since the quality of most services depends largely on the quality of the individuals providing the services, it is true that "people costs" are a high component of service costs. Whereas a manufacturer may use technology, simplification, and other techniques to lower the cost of goods sold, the service provider often faces an unrelenting pattern of increasing costs.
"Differentiation is often difficult. For example, how does one choose one investment adviser over another, since they often seem to provide identical services? Charging a premium for services is usually an option only for the most established firms, who charge extra based upon brand recognition."
http://en.wikipedia.org/wiki/Service_industry#Issues_for_service_providers