If you have a poor Burmese woman who is desperate for a job and you tell her that part of her job description is sexual services, do you really think she will say no? She will say yes for sure so she can have an income. You have all the power in the relationship. She isn't making a decision based on her own will; it is purely out of desperation. Do you really think these women grow up dreaming of having a fat sweaty old farang climbing on them every night?
If, on the other hand, you take a bar girl and offer her a live in arrangement, then that is a little bit different. She has already decided that she wants to make a living having sweaty old fat farangs climb on her every night. I know a girl who makes 30,000 Baht a month living with a farang. She was a whore when he met her and he pays her like a whore now.
If somebody can't see the difference, then you have no conscience as far as I can tell.