
Nymphomania is a clinical term, since a mania means an obsession or a compulsion. Since it involves the titillating idea of a woman who has an insatiable appetite for sex with different partners, the concept has become a pretty popular idea in mainstream culture. Women can obviously have significant sex drives, wether it's with strangers or partner(s), without being compulsively driven to sex. When it is a compulsion it can be considered a psychological condition, with the problem being that the addict engage in sex all the time, but get very little joy out of it. For men, the same condition is known as Satyriasis.
People often just use the phrase casually, meaning someone who has a high sex drive and does really enjoy themselves. This misunderstanding of the term has become more and more positively seen in pop culture.
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