Jennifer Garner: Ben Affleck Has 'Wonder Sperm'

Already father to three adorable children, Ben Affleck is eager to continue procreating with his wife of seven years, Jennifer Garner.

Unfortunately, the "Butter" actress, 40, says her childbearing days are over. "I am not pregnant right now," Garner told Ellen DeGeneres on the comedienne's eponymous talk show (airing Sept. 27). "I plan to be done. But my husband is kind of a wonder sperm kind of guy."

PHOTOS: How Ben Affleck and Jennifer Garner fell in love

"Good to know," DeGeneres, 54, laughed.

"You never don't know," Garner responded. "You just have a look at him!"

Her husband's virility aside, Garner admitted that looking after three children is proving to be a challenge. (She and Affleck, 40, are parents to daughters Violet, 6, and Seraphina, 3, and son Samuel, 7 months.)

PHOTOS: Jennifer Garner's life as a supermom

"I mean, they didn't pee in my eye. I don't know if it's because he's a boy. I don't know if it's because he's my third and I forget that I have him," the West Virginia-born actress admitted. "You know you're just dealing with two and then you think, 'I put a baby down. I swear I put a baby down somewhere.' And you kind of walk through the house. 'There you are!' He's just happy as can be."

PHOTOS: How Violet Affleck has grown up

Garner added that Samuel "is so chill and mellow ... He's perfect right now because he doesn't move. But he sleeps pretty well. He reaches when he sees me and he laughs a lot. He thinks I'm super funny. What more do you want?"

This article originally appeared on Usmagazine.com: Jennifer Garner: Ben Affleck Has "Wonder Sperm"

b>MORE ON WONDERWALL:

Celeb Power Couples: Who Wears the Pants?

Reformed Celeb Bad Boys

Hottest Co-Star Couples: Better On-Screen Or Off?