Girls in Massage Salons usually don’t offer sex – it’s different in the erotic massage parlours of Phnom Penh with fishbowl arrangement then the massage is 10 USD plus 50 USD (negotiable) for “Boom Boom”, yes they call it the same like in Thailand.
By the way, blow job means yam yam in Cambodia and prices for that start at 20 USD.
Then when the time has come they usually ask for 50 USD for some dirty short time fun in your hotel room. If you are looking for something similar to the Go Go Bars in Pattaya you have to be patient as there are no Go Go Bars in Cambodia (yet) – neither in Phnom Penh nor in Siem Reap.
Yes, you can take out the girls for sex if you want, but you will need to talk and arrange with them separately.
Now, new such places full of young and hot Cambodian girls are being opened almost every month all around town. Like the infamous “Heart of Darkness” which has been the only night club for foreigners to meet Cambodian hookers for centuries.
Now there are several great night clubs all around town that attract countless of chicks every night.
Means if she goes with a customer and has sex with him she charges money that goes 100% in her own pocket.
These days the girls usually ask for 50 USD for short time (one or two shots, 1-2 hours) and 100 USD for long time (several shots, usually until breakfast the following morning).