Not sure how my formatting is going to look, but I'll give it a shot...
Standing: Ron & Bill, Kaylani & Lisa, Amani & Marcus, Jeremy & Sandy, Bill & Cathi, Andy & Tommy
Kneeling: Liz & Marie, Justin & Jennifer, Ethan & Jenna, Laurence & Zac, Ernie & Cindy
... let's meet the contestants...
Liz & Marie: Twin sisters
Kaylani & Lisa: Best friends and cocktail waitresses, from Las Vegas
Ron & Bill: Domestic partners and flight attendants
Amani & Marcus: Former Indianapolis Colt tight end and his wife
Jeremy & Sandy: Dating
Bill & Cathi: Teachers
Andy & Tommy: Professional snowboarders
Justin & Jennifer: Brother/sister
Laurence & Zac: Father/son boating enthusiasts
Ernie & Cindy: Newly engaged
... and of course... the headliners...