Wow, I'm suprised no one replied...
OK, I've been to Adelitas enough:
Hell YES they accept dollars, as do ALL the businesses in that area. It's actually a bad idea to trade for pesos as the added confusion will end up with you getting ripped off. Besides, what you gonna do with pesos afterwords?
Here's how it works: You walk in (ignore the door men) and once you get past the curtain you'll enter a big ass room with two sections that is hotter than the deepest pits of hell. But thats OK, the girls are hot too.
OK, you'll see about a million guys standing around, and a million girls. If you want to sit and relax, good luck on finding a table. If there is a waiter in the area of a table, tell him table, and he'll sit you down. He will kick out any worker ladies sitting around. There is a sign posted up on the wall in the smaller room with drink prices. Very decent compared to some TJ places. Girls drinks cost more btw (like $8?). Tipping waiter $1-2 is plenty.
Anyways, there a millin girls sitting around. No need to be coy, everybody knows exactly whats going on in that place. Most likely you'll get a couple of em coming up to you gesturing to go next door (the hotel) or saying in meager english "go f#cky?" Or something like that. So yeah, basically they understand english. If you see a girl you like, don't be shy, and act fast, go to her and say lets go. It's as easy as that.
She'll walk you out the front, take you to the left (don't get intimidated for the million guys outside waiting for their buddies to pop out) to the very next door which is a hotel. The room I believe is like $10-13.. I forget. The girl will tell you. They will take her purse, give her a room # and "kit" (towel, condom,etc). Just follow her.
Usually, chick will tell you to undress, while she undresses. She will lay on the bed (lot of TJ dead fishes), and wham, bam, thank you senorita. I believe there is a 30 min time limit. Anyways, afterwords you should pay her $50-60. I think the going price WAS $50, but it has creeped up. There is no reason for her to be charging anymore than $60 unless you agreed upon some other stuff and did something unusual. I've had a friend cornhole a chick but that didn't cost him anything extra (heinas throw coochie at him all day). IF you want to be generous, tip like $5 or something.
Afterwords, there might be a guy outside (maid/htoel boy) asking for tip to clean the room. If you totally thrashed the room, give him $1 or $2 if you like, I dont think you have to. And if he isn't the one cleaning your room, just ignore his ass and walk on.
So, from the time I step foot across the border, I usually pay:
$6-7 for taxi (tip included) to Adelitas
$20 on alcohol (I tend to drink a bit)
$13 for room (with tip for maid/hotel guy)
$60 for the chick
and $6-7 for taxi back to border (just say "border")
$8 for tacos, soda, etc. (I dont trust the hot dogs)
For a grand total of about $115 for a pretty good night.
Many people would say I am overpaying already, so keep in mind you might be able to pull off the whole package for like $85 if you are on a budget and don't drink/eat as much.
And to touch upon the language thing again, if you use basic words like: f___ bl_wj_b, taco, corona, etc, you'll be fine. Dumb down your english and avoid the big words, and you'll be OK. Like I said before, everybody down there knows exactly whats going on (including the cops) so don't worry too much and have a good time.
Hope that helps, let me know if you have any other questions.