What's the difference between sagacity and salacity?

Sagacity

Definition:

(n.) The quality of being sagacious; quickness or acuteness of sense perceptions; keenness of discernment or penetration with soundness of judgment; shrewdness.

Example Sentences:

(1) In 1990, aged 42, I wrote an article for the New Statesman on the fortysomethings – the 60s generation, baby boomers, learning how to deal with the sag without yet acquiring sufficient sagacity to fight off the message that the secret to surviving a midlife crisis was holding back time with hormone replacement therapy.
(2) A youth-obsessed society that makes a mint from mining the alleged horrors of growing older – all sag and no sagacity – has locked us into a set of taboos that means millions of us are moving from middle age into possibly decades of allegedly unproductive, dependent, parked-up old age without sufficient armament or attitude of mind to challenge prevailing prejudices.
(3) At times, there were suspicions that the mask was all there was to Mandela; that had his grasp of the situation been quite limited, it would have made no difference to his reputation for sagacity, such was the mystique surrounding him.
(4) The Author has collaborate with the Anthos advised some sagacity and modifications, especially at the waterworks, for render "surgical" a regular odontological compact instrument.
(5) A cure for the ailing church “would require a much deeper ecclesial comprehension than the present leadership currently exhibit … There seems to be no sagacity, serious science or spiritual substance to the curatives being offered.” Rather, he says, the church “is being slowly kettled into becoming a suburban sect, corralling its congregations, controlling its clergy and centralising its communication.
(6) The sagacity of performing surgery for hip dislocations is raised.
(7) If seeming to lack dynamism, in conversation he conveyed an impression of calm sagacity and was widely respected in Sierra Leone.
(8) Questions are raised as to the strength of the evidence, the sagacity of abandoning the hypothesis, or the probability of this sample size detecting differences.
(9) Because of their sagacity, dwarves and jesters were not only allowed but expected to goad and pastiche the noble or the monarch they served, forever reminding their masters of the empty vanity of power.