tomika brings me to one of them, daitoro, to meet some friends.beef intestine and fermented chicken. this place is known for its motsunabe, intestine stew with miso. so we order some of that as well. this is naga, invited along to help translate. naga owns a company, but naga also teaches pole dancing for men. then there's this man, one of the best known and most respected practitioners, a master of the art of ropes of beautiful knots, of for what lack of a better word, we call bondage. so how big is the sadomasochistic community? how many people are active participants? >> translator: 100,000 people. >> a lot? >> a lot. >> this is shubare, translation, to bind. it makes things more confusing, a comfortable reaction for what sure as hell looks pretty disturbing. tomika, who spends most of her time ripping, burning, and generally abusing men, enthusiastically reverses roles in her longtime relationship with hajami. it looks like a very delicate procedure. does it hurt? or does it feel good? >> translator: this pain change to the ecstacy. to the exc

i can' >> reporter: on memorial day brian and tomika' s home caught fire. 3 of the kids were burned and several others suffered smoke inhalation. >> i was in the hospital 3 days. >> reporter: but why didn' t the robertsons have more time to escape? after all, they said they had two working smoke detectors. >> even with all the smoke that dame out of the room, there was still no sound of the smoke detector. it never went off. >> reporter: the robertsons say they had the most popular kind of smoke detector. the ionization type used in 90% of american homes. according to the national fire protection association. fast- moving fires, but experts say not in slow smoldering fires. the kind that kill most people at night. >> if you have an ionization detector, the fire may burn for detector sounds. >> reporter: news 6 investigates. we compare the ionization smoke detector to the newest photoelectric smoke detector said to be much faster. first we insert two hot pins smoldering fire. we start the time clock and almost immediately smoke begins to build. at 4 minutes 5 seconds the photoelectric sm