ON A TWO-HOUR "20/20," FRIDAY, AUGUST 3 ON ABC

· "Billionaire Secrets: What They Know That Can Change Your Life," Anchored by Barbara Walters, Airs on 9 p.m., ET

· "My Ultra Modern Family" Airs at 10 p.m., ET

9:00 - 10:00 p.m., ET: "Billionaire Secrets: What They Know That Can Change Your Life"

In these troubled times Barbara Walters shares advice for viewers that's worth listening to from four self made, out-of-the-box creators and thinkers who made it big the old fashioned way - by creating products that people want. They are four unique and surprisingly different billionaires who tell their stories of how they made it and now how they give back. They impart their wisdom and tips that can put viewers on the road to huge success too: John Paul Dejoria, a once homeless visionary who built two iconic companies, Paul Mitchell hair care and Patron Spirits tequila; Lynn Tilton, who specializes in buying companies and breathing new life into them; Guy Laliberte, a street performer turned billionaire circus ring leader as creator of Cirque du Soleil; and Tony Hsieh, CEO of billion dollar business Zappos. (OAD: 10/28/11)

10:00 - 11:00 p.m., ET: "My Ultra Modern Family"

How far will some women go to become a mom? In a surprising trend, thousands of women and couples are turning to a bold new option: instead of expensive and invasive sperm banks and fertility clinics, they are getting free sperm on the internet. "20/20" follows several women desperate to have children and willing to turn to this underground universe of online link-ups, meeting men on the internet to exchange this gift of life. But the possible rewards are not without risks. Who are these women willing to take the chance on free, untested sperm, and who are the men willing to supply it, often donating in the most unexpected places? Elizabeth Vargas investigates the brave new world of online donation. (OAD 1/13/12)

Vargas also reports on the secret world of polygamy with a rare look inside the Darger family of Salt Lake City - a family with one husband, three wives and 24 kids. (OAD: 11/18/2011)

Preview links: http://abcnews.go.com/2020

David Sloan is executive producer of "20/20."