Scrolling through dating websites a year ago, Indonesian app developer Lindu Pranayama realised there were a lot of married men looking for another wife - but few online services to meet their needs. "When they go to regular dating sites, they don't see options for polygamy. They don't see options for finding second, third or fourth wives," he said. Enter "AyoPoligami" - a new smartphone app developed by Pranayama, which aims to "bring together male users with women who are willing to make'big families'." Loosely translated as "Let's do polygamy", the Tinder-style dating app has already stirred up controversy since its April launch in Indonesia, where over 80 percent of the 250 million population are Muslim and polygamy is legal.