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Desperate Housewives star Eva Longoria has imposed a 'no-sex' policy on her fiance Tony Parker until the couple exchange vows in July.

The actress implemented the ban to help basketball star Tony reach the NBA play-offs with the San Antonio Spurs.

She told US chat show host Jimmy Kimmel: "Luckily, we're getting married after the play-offs and then we need to consummate the marriage. I scheduled it that way."

The sex ban seems to be helping Tony's performance on the court - his team beat the Phoenix Suns on Sunday.

Eva, 32, also dismissed rumours the couple chose to marry in Paris on July 7 because it is considered to be a lucky date.

She said: "We picked that date because it's the only weekend we're both off."

Meanwhile, Eva partied with Jessica Simpson in Las Vegas at the weekend.

Eva cheered on Jessica as the singer joined the Pussycat Dolls on stage at Caesars Palace's Pure nightclub.

Jessica - who invited Eva to appear in her Public Affair music video - wowed the crowd by wearing a tight fitting black corset and flowing brunette locks.

The friends later took to Pure's dance floor along with Eva's pal Mario Lopez.

Mario and Eva were then seen at the star-studded boxing match between Oscar De La Hoya and Floyd Mayweather Junior at the MGM Grand on Saturday.

Jack Nicholson, Matthew McConaughey, Leonardo DiCaprio, Will Ferrell, Jim Carrey and Jenny McCarthy were also in attendance.