Google the site.  Lots to read.  Don't know if the Ritz is on the "girl friendly" hotel.  90% of them seem to be, but they will want to see the girl's ID before they let her up.

The following is directly from the web site:  
"Hotels located in red-light districts are used to receive night visitors. If you are planning to go wild, then you may want to choose a room in Chinatown, Mangga Besar, Gajah Mada, Kelapa Gading, Mangga Dua, Blok M or Taman Anggrek.

Some naughty hotels also offer plus plus massage services in the room or in their spas. For example: Orchardz Industri, Orchardz Jayakarta, Orchardz Hotel Airport, Sparks Life, B'Fashion, Fashion Hotel (Gunung Sahari), Prinsen Park, Olympic Hotel.

At last, you also have some famous transit hotels such as Hotel BI Executive in Ancol. In this hotel, rooms have mirrors and porn movies are available at reception. You can also park you car just under your room if you want to be discreet.

Can I actually sleep in Alexis Hotel, Malioboro Hotel, Classic Hotel, etc?

Brothels in Jakarta often have a hotel license because it gives them more flexibility with the law. In particular, it allows them to open during ramadan."

Even though they are not listed on the traditional online booking engines like Agoda or Booking.com, they do accept guests.