alex waterfield takes us to the philippines and take us inside the raid. >> reporter: tonight in a far, arthur benjamin is in a good mood. >> all the girls around i'm good. >> reporter: laughing, drinking ogling the girls on stage at this bar which he says he owns. benjamin is a 49-year-old american suspected of having sex with underage girls and suspected of selling them for sex out of this bar called crowbar. but he has no idea that at that moment, filipino and american authorities are just a few miles away plotting a raid that will bring his world crashing down. >> we're ready. >> reporter: this is the story of arthur benjamin who travelled to subic bay, a beautiful part of the philippines where benjamin has been living for 25 years. but our journey went into the dark and disturbing world of underage prostitution finding how easy it is to buy sex with underage girls. how old are you? >> 14. >> reporter: it is a top destination for americans not just looking to have sex but to sell sex as well. >> about 4 third and 00 girls working for me. and they go all night for 30 bucks. >> the a

to investigate the rampant underage prostitution, producer alex waterfield and i go undercover with hiddenameras. we'd been told about this man, arthur benjamin, a 49-year-old texan who has lived here for 25 years. he's suspected of pimping out underage girls from his bar. over coffee, he tells us about how he melt his 16-year-old girlfriend. >> needed somebody to take care of her. come here. you know what i want. >> reporter: and how, with the help of his bar manager, lucy, underage girls have worked in his bar. one of them is 16-year-old princess, who has given us permission to show her face. little did benjamin know, filipino and american authorities were planning a raid on his bar. >> that's it. go, go, get out, go! >> reporter: benjamin is stunned. that's when we reveal ourselves to him. we're with abc news. you told us that you have had underage sex with multiple girls and underage girls have worked in this bar. >> i have never had underage girls here and i do not have sex with underage girls. >> reporter: then, we tell him we have it on hidden camera. does that change anything that

to investigate the reports of rampant underage prostitution, producer alex waterfield and i go undercoveridden cameras. we've been told about this man, arthur benjamin, a 49-year-old texan who's lived here for 25 years. he's suspected or pimping out underage girls from his bar. over coffee, he tells us how he met his 16-year-old girlfriend. >> she needed somebody to take care of her. you know what i want. >> reporter: and how, with the help of his bar manager, lucy, underage girls have worked in his bar. one of them is 16-year-old princess, who has given us permission to show her face. little did benjamin know, filipino and american authorities were planning a raid on his bar. that's it. >> get out, go! >> reporter: benjamin is stunned. that's when we reveal ourselves to him. we're with abc news. you told us that you have had underage sex with multiple girls. >> i've never had underage girls and i do not have sex with underage girls. >> reporter: then we tell him we have it on hidden camera. does that change anything? >> not at all. >> reporter: he was arrested. activists say authorities