I just thought you would like a blokes "side" of this sinario. I thought it strange at first but came to the conclusion that it must be a way of life for many.
Im a tradesman and over the years many woman have offered sex in exchange for paying although Ive only accepted sex a few times as payment, (for various reasons).
I found that you can usually tell from the moment you arrive on the job, who is going to offer sex. Some are topless, some in their underware, some with just a towel on, some let you know when they are going to have a shower etc... I even had a mother and daughter "gang up on me" one time, (that was fun).
Anyway, I cant see any thing wrong with doing this. Its only a form of payment for services rendered.
"Works both ways" you could say.
Cheers