Closed Captioning ON OFF apply | reset x Text Display Background Enhancements font Times New Roman Arial Comic Sans size T T T T color share link October 12th, 2013 Why do we kiss? The science behind a smooch Kissing is a language all its own, and a new study reveals it's a filter for finding that perfect partner. TODAY's Craig Melvin reports. More video Sponsored Content Now Playing Florida Spring Break Hot Spot Might Cancel the Party Sponsored Content Now Playing Md. 'Free-Range' Parents Battle Child Protective Services Again Sponsored Content Now Playing Ugly Christmas Sweater Trend Spreads Nationwide Sponsored Content Now Playing Why Statues in Portland Are Dressed in 'Ugly' Christmas Sweaters News Life Now Playing Nightly News Full Broadcast (July 29) Now Playing Wounded Warriors Hit The Links Now Playing Hot Job in the City: Workers Deal With NYC's Sweltering Temps Now Playing Quakes Rattle Oklahoma Most Watched Now Playing Sponsored Content Mothers of teens missing at sea have faith in their skills: 'They're out there' Now Playing Sponsored Content Hope to It: Helping homeless women start over Now Playing Sponsored Content Madeleine McCann detectives contact Australia about remains Now Playing Sponsored Content Jen Welter becomes first female coach in the NFL Now Playing Sponsored Content Still no sign of 2 Florida teens who are missing at sea Now Playing Sponsored Content Mike Huckabee: Jews support my Holocaust comments Now Playing Sponsored Content Trump's attorney sparks outrage, saying: 'You can't rape your spouse'