A British teenager slumped dying on her boyfriend's couch seconds after their first kiss, apparently from the thrill of it, according to authorities. Jemma Benjamin,18, died of sudden adult death syndrome, an extremely rare heart condition. As the couple finished kissing, Jemma's "eyes drooped" and she began frothing at the mouth, her boyfriend testified at a recent inquest. He called her mom to find out if she suffered from epilepsy, then gave her CPR as instructed by an emergency services phone dispatcher. "She was the picture of health one minute, and taken from me the next," her mom told the Telegraph.