Cheaters never prosper –except in Pacific Heights and the Marina.

So says data from AshleyMadison.com, the controversial dating site for married and otherwise attached people looking to find partners on the side. Apparently there are 52,252 people in the Bay Area who use the site, and Ashley Madison was able to determine which city neighborhoods have the most site users per capita. Hint: the wealthiest guys and gals are most likely to be the culprits.

The top neighborhood was Pacific Heights followed by the Marina, the Financial District, the Sunset (is that why all those “massage parlors” are there?), Nob Hill, Noe Valley, Sea Cliff, South of Market, Russian Hill and North Beach.

The site revealed that 43 percent of its San Francisco users are female, Sea Cliff’s cheaters have the most affair partners, and Noe Valley cheaters have the most children on average. (Duh, it’s Noe Valley, land of the Bob stroller.)

Affluence is the common factor on most cities’ top ten lists, said the site’s founder, CEO Noel Biderman.

“The proclivity to cheat often goes hand-in-hand with opportunity,” he said. “Those with discretionary income and freedom to travel are even more likely to stray.”

Or at least more likely to pay to use a dating site.

Heather Knight is a San Francisco Chronicle staff writer. E-mail: hknight@sfchronicle.com, Twitter: @hknightsf