Men looking for sex filed in and out of a gray two-family home on Haskell Street in Allston for 12 hours a day, every day, police said.

One week last June, investigators counted at least 184 men who passed through the rusted chain-link fence outside the house en route to upstairs bedrooms, where authorities allege young Asian women in lingerie performed massages and sex acts in exchange for about $130, court papers said.

Behind the operation, which advertised as Amy’s Asian Models on Backpage.com, was a married couple who lived in West Roxbury: Kim Kew Chow, 68, and his wife, Yuet, 53, prosecutors said.

“We allege that the Haskell Street property was used for the purposes of human trafficking 12 hours a day, seven days a week, with victims brought in from out of state to sell sexual conduct for cash,’’ Suffolk District Attorney Daniel F. Conley said Thursday in a statement.

The couple was arraigned Thursday in Suffolk Superior Court on charges including human trafficking and keeping a house of prostitution. They pleaded not guilty with assistance from a Mandarin interpreter.

Bail was set at $500,000 each, a sum that Yuet Chow’s attorney called “ludicrous.’’

Lawyer Carmine Lepore, who represents Kim Chow, said the case represents a “knee-jerk reaction’’ to problems facing Backpage.com, which closed its adult advertising section in the United States earlier this week.

Backpage.com’s announcement came after a Congressional panel released a report alleging that the website facilitated child sex trafficking.

“The whole case is blown out of proportion,’’ Lepore said outside of court.

He and defense lawyer Robert L. Sheketoff said the couple is not accused of engaging in violence. A hearing was set for Friday afternoon so the Chows could seek lower bail. They have been in custody since their arrest in September and were indicted last month, authorities said. A trial date was set for Sept. 26.

Boston police last May began investigating suspicious activity at 6 Haskell St. after an anonymous tipster reported the constant flow of men, who typically stayed for about 30 minutes, said Suffolk Assistant District Attorney Lynn Feigenbaum.

The tipster said “sexual sounds’’ could be heard from the residence, where young Asian women were seen wearing bathrobes and smoking cigarettes on a rear porch, according to a Boston police affidavit filed in Brighton Municipal Court.

Investigators began watching the property and interviewed some of the men who visited, Feigenbaum said. The men said they called a telephone number in the Backpage.com ad and spoke with an Asian woman, she said.

An address was texted to the men’s cellphones. When they got there, they called the same woman who directed them to 6 Haskell St., Feigenbaum said.

At the property, the men were greeted by Yuet Chow, who directed them upstairs, where they paid a fee in exchange for sex, Feigenbaum said. Some of the money went to the young women and the rest went to Yuet and Kim Chow, Feigenbaum said.

During the investigation, detectives tracked the couple’s movements, learning that Kim Chow arrived at the Haskell Street apartment daily at 8 a.m. and stayed there until 11:30 p.m., Feigenbaum said. The apartment lease was in Kim Chow’s name and paid for through the couple’s joint bank account, she said.

Detectives also tracked Yuet Chow’s visits to Equinox Sports Club in Downtown Crossing and twice recovered trash bags containing used condoms and other garbage that she threw into city barrels on Washington Street, the affidavit said.

In September, police searched the Allston residence, where they found three young Asian women who had come from New York City to work for about 10 days, along with condoms and customer appointment ledgers, Feigenbaum said.

At the couple’s home in West Roxbury, police found about $20,000 in cash, condoms, and ledgers, she said.

Kim Chow is a US citizen, Lepore said. Police seized a Hong Kong passport belonging to Yuet Chow, court records show.

Sheketoff said the human-trafficking charges aren’t supported by the prosecution’s evidence.

“What did you hear that says that it’s human trafficking,’’ he asked outside court. “There’s nothing.’’

Conley’s spokesman Jake Wark disputed that claim and said the defense was downplaying the allegations.

“Human trafficking takes many forms, and the idea that it’s only a serious crime when its victims are literally chained to radiators is outdated and inaccurate,’’ he said.

Laura Crimaldi can be reached at laura.crimaldi@globe.com. Follow her on Twitter @lauracrimaldi.