Best advice I was ever given (by a caring uncle) was "always make sure the lady gets her cookies first."
Second best (same uncle) was "the little man is at the top of the boat."
Research if those sayings do not make sense to you. You will be a better lover by heeding those words of wisdom.
Fortunately (unfortunately at the time but hindsight changes your views) an early girlfriend was kind of a prude but a horny as shit prude. No penetrative sex until marriage but she could/would suck a cock like nobody's business. She also wanted her "O" and that came first through fingering and then DATY. I learned from and on her.
Since then, I have mastered the art and have never had an unappreciative lady--RW or hobby. I get why a guy may not go down on a hobby lady (although I disagree with most of the reasons, especially if you are seeing a reputable provider) but if you are not eating your RW conquests, you are missing out on a great experience and so are they.
Just like getting your dick sucked, there is a technique or it is an act of futility. You cannot simply go all willy-nilly and while the basics are the same, every gal needs it worked a little differently. Reading body language is a big key. Luckily for you younger types (and older types that never learned), google is your friend. There are as many articles and videos to help you out with DATY as there are to repair your lawnmower!!!
I am with those that if DATY is not on the table, I am probably out--RW or hobby. If I cannot eat it, I have little interest in fucking it. Luckily, most ladies enjoy oral pleasure and if you do it right, they are usually more apt to invite you to play again and again.