TER General Board
There are a number of things at play. There has been a lot of research in to the symbiotic relationship between 'feelings' and the biochemical reactions that either precede, goes along with, or follow them. (By emotions, some people mean things unrelated to biochemistry, but it can be tricky to differentiate.) We do know arousal and sex are involved in hormone generation/release.
A breakdown by a noted doctor has it as:
1) Lust (the craving for sexual gratification), driven by androgens and estrogens;
2) Attraction (or romantic or passionate love),driven by high dopamine and norepinephrine levels and low serotonin;
3) Attachment (the sense of calm, peace, and stability one feels with a long-term partner) driven by the hormones oxytocin and vasopressin.
Personally, I think it is hard to not have emotions involved in sex. It is more the question of what one does with them when they arise. In this realm many will compartmentalize or suppress to the best of their ability, which can cascade to fallout in certain hormone levels going higher or lower.
#3 above is probably the one which will most manifest itself in any long term relationship, not matter if there is an exchange of funds or not.
Usually shorting the envelope.
there was no high dopamine and norepinephrine levels and low serotonin, involved? No oxytocin and vasopressin running around inside you pretty little head???
Please tell me there was at least SOME androgens and estrogens!!! Wasn't there?
Sex with a woman who loves you, cares about you and has a sense of shared destiny with you is so qualitatively superior at every level that it can be called "lovemaking."
Sex with a woman who secretly hates your guts, wishes you were dead, and thinks you are an inferior subhuman (ala the erstwhile MacDaddy) is called FUCKING.
When you leave, that smile goes away and she's gagging into the toilet; jumping into the shower and yelling "out damn spot."
Most sex in the hobby falls somewhere in between those extremes, depending on a huge number of variables. But within the hobby, I'd say most of it falls a lot closer to fucking than lovemaking; though some minority of it certainly falls closer to lovemaking than fucking.
Human beings were not built with the ability to draw very good distinctions between phony experiences (i.e. movies, appointments with escorts) and real ones; in terms of emotional response. That's why TV advertising space is so expensive -- it's effectiveness is based on this human deficiency.
Just read what ladies like literbike have to say, though.
I am NOT saying that there is never some genuine positive emotion on the escort's end. I'm just saying that whatever the appearances may be, 99.9% likely it is NOT romantic love.
Frankly, even if she TELLS you that she is madly romantically in love with you, you should actively disbelieve unless she says it in conjunction with donating a kidney. 
sportfucking does not appeal. if i don't like a person i'm not going to want to have sex.
i recognize this is a "minority report".
the hobby works best for me when there is some degree of mutual like: Friends With Compensated Benefits is the way i like the hobby. nobody else has to. 
those of you who disapprove can go kiss someone else's ass 'cause you're no friend of mine.