The 24-year-old actress tops the Web site's list ranking female celebrities on their "long-term relationship material." Alba is followed by "Alfie" star Sienna Miller and the ubiquitous Angelina Jolie.
The list will be posted Tuesday.
James Bassil, editor-in-chief of AskMen.com, told The Associated Press the list was determined by the rankings of 2.5 million readers and by the site's staff.
Readers of the online magazine were asked to vote according to the woman they would most want a relationship with, would consider marrying or thought best-suited to be the mother of their children.
Of course, few have ever accused Alba, Miller or Jolie of being short on movie star glamour.
"We encouraged readers not to go on looks alone," Bassil said. "I don't believe it's an entirely accurate reflection of what a reader strives for in their long-term relationships, but at the same time, it's not a sheerly surface appreciation."
The rest of the top 10, in order, is Brazilian model Adriana Lima (No. 1 last year), "Access Hollywood" correspondent Maria Menounos, Charlize Theron, Jessica Biel, singer Amerie, Natalie Portman and Eva Longoria.
Britney Spears -- a mainstay of such lists in previous years -- failed to chart.