Couples in Thailand are marking Valentine's Day by attempting to break the Guinness world record for the longest continuous kiss. The current record stands at 32 hours, 7 minutes and 14 seconds, set in Germany in 2009.

Kicking off at dawn on Sunday, each couple was given a space of 1 square meter in which they have to spend the time kissing. They're only allowed to leave the area for bathroom breaks. If the lovebirds' lips part - even for a moment - they'll be disqualified. They're also not allowed to sit or sleep. The winning couple will be rewarded with a diamond ring and a cash prize.