I've always been so independent, that I actually struggle with letting anyone offer to pay anything for me. I will however, be content to pay for everything. Which I am now learning is wrong, and as said in another post, leads to abuse. I would never in my wildest dreams, expect anyone to do anything with me, that they were unwilling to do. Intimacy will naturally occur if there is any chemistry.
This to tell you, that despite me being the one who usually paid, there was sometimes still the expectation that I should "put out". It depends on the person. If they are intent on having sex, they will have that in mind, without consideration of who pays for what.
So we can't really generalise. People are all different, and as you receive different opinions here, you will have as many more in real life.
Just never, ever, do anything out of what may be perceived as an obligation. You have no accountability to give out your body under pressure.