I try to tell new guys this is not your high school prom, and neither you nor the ho are virgins having met at church with your mothers in attendance...
Another thing is you're on vacation, what's your hurry?
Take time to get to know a ho you're interested in, if she rushes you, thank her and walk.
Can't speak Spanish and she can't speak English? Use the voice part of Google translate on your cell, it's fun, and you shy boys can say bold things and you both will laugh.
Not only do I strongly pin them down on what I want and get 100% agreement or close enough, I'll compromise if need be.
It's also more than getting agreements, gauge how she's reacting to you. Is she fun and interactive? Does it seems like she can enjoy your company? Do you like her personality? Are you communicating?
They don't care if you're young and handsome, they're used to ancient old geezers, many undesirable under the best situations, but if you're waving cien, you're a movie star or male model to them so don't worry about that.
One of my new nervous friends on his first ho visit asked me "What if I can't perform???
I said "Then you ask her to pretend you do", and tell you it was one of her best poundings ever, lol.
Seriously, don't be in a rush and certainly don't expect she'll volunteer what you want if you're too shy or embarrassed to ask.
Sure, many times you get a good one and you're lucky she goes to work, but many times you can sniff out a bad fraud by talking and asking questions, then face reality.
The beauty here is there's one sitting next to her that just might meet your requests, jettison the arrogant cons and search for the good ones.
One more thing. Avoid industry terminology like "bare back blow jobs".
Most will have no idea what you're asking for, it's blow sin condom here.
Follow these guidelines for minimal hassles and also let them know you pay afterwards before heading to your room, no exceptions, so when you get to the room, there's no arguments.
Any ho that asks for money up front, thank her and move on, and feel free to use one of my famous sayings...
"There will be no further discussion of this issue"...