A hard-partying Wall Street trader and his ex-girlfriend are in court over an allegedly broken $100,000 promise to keep on the straight and narrow.

In recently filed court papers, Elisa Kwon accuses her former beau Greg Calvino, 45, of reneging on a pledge he had made to not `use drugs, stay out late, frequent strippers or prostitutes.` The 30-something Kwon insists Calvino had vowed that if he ever did any of those things again, she could cash a $100,000 check he had made out to her.

After Calvino`s allegedly debauched boys` night out at a strip club, that`s just what Kwon did. But a fuming Calvino filed suit in Manhattan Supreme Court to get his money back - plus interest, legal fees and damages - claiming the whole thing is an extortion attempt.

Calvino claims Kwon had threatened to go to his bosses at RBC Capital Markets, where he was a stock trader at the time of the intemperate night out, and make up tales of drug use `with strippers and whores.` He claims he wrote the $100,000 check to protect his career and reputation, and that she cashed it for no apparent reason. But Kwon, in a motion to dismiss filed on Sept. 20, said Calvino`s drug use and wild ways with women entitled her to the money. She said she cashed the check in November 2005, after he went out with fellow RBC traders to ogle the girls at Flashdancers and do cocaine that March. What`s more, he failed a store-bought drug test of his urine, she claims...

http://www.nypost.com/seven/0930200...