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Why do men have to wait for 'round 2'?

If you type into a search engine—"why do men have to wait before having sex again?"—the results will include many references to prolactin. This hormone is thought to be involved in hundreds of physiological processes ...

Web search engine

A Web search engine is a tool designed to search for information on the World Wide Web. The search results are usually presented in a list and are commonly called hits. The information may consist of web pages, images, information and other types of files. Some search engines also mine data available in databases or open directories. Unlike Web directories, which are maintained by human editors, search engines operate algorithmically or are a mixture of algorithmic and human input.

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