I was born and raised in Dallas, and get the chance to spend an awful lot of time there.
Dallas is extremely "Gay Friendly," and you'd be hard pressed to meet anyone here he doesn't claim to "know someone who is Gay."
Gay Pride Parade in Dallas takes place in September because it's too damned hot to have it June!

Usually there are more than 10,000 in attendance just for the parade alone.
Dallas has THE Largest "Gay Church" in the country, called The Cathedral of Hope.
The "Gaybor-hood" is known as "Oak Lawn / Cedar Springs," and us locals call it "The Crossroads." You'll find all of the bars that cater to the the Gay Community there; JR's Bar and Grill (we jokingly call it an S&M bar, but that S&M means "stand and model."

), The Round-Up is where you'll find Cowboys (both the Dime-store variety, and ocassionally some real ones!), Throckmorton Mining Company which is more "Bear" friendly, and then there's S-4, with caters to the younger crowd, and it's a great place to dance your ass off! All within about one block walking distance of each other.
However, I have Gay friends who live all over the city; Uptown, Oak Cliff, Downtown, Deep Ellum, Turtle Creek, and Southside.
As for Denton, Texas? It's about 45-60 minutes (depending on traffic) up I-35 from Dallas. Being that it's home to the University of North Texas chances are you'll find Denton as liberal (if not more so) than Dallas. There's a great live music scene there, and it's generally where most of my friends go to see their favorite "alternative music" groups.
As someone who has lived in San Francisco, New York City, Boston, and Miami, I'm just as comfortable in Dallas as a Gay man as I am in any of those cities. But like everywhere else, you'll want to be aware of your surroundings.
To avoid any trouble or confrontation, I do tend to "butch it up" a bit out in the country, which is where I live now.
As for Fort Worth, I can't speak much to that city except to say that the difference between Dallas and Fort Worth is like the difference between night and day. I mean that in a good way.
Fort Worth and Dallas are only 30 miles apart, but Fort Worth is much more laid back, less pretentious, and generally everyone that I've met or know there are pretty much "live and let live." They have a smattering of Gay Bars, and their own Pride Parade each year, and in my opinion Fort Worth has more of a "home-town" feel about it.
The "big city" between Dallas and Fort Worth is Arlington, Texas. It's called the "Entertainment capital of North Texas." Last I checked they only have one gay bar, despite being home to the University of Texas at Arlington. However you'll find Six Flags over Texas (The original Six Flags Amusement Park), The Texas Rangers Baseball teams is there, and before too long it will be home to the Dallas Cowboys.
You didn't mention where in Wisconsin that you'll be moving from, but having visited Wisconsin on several ocassions, DFW / Denton are like the best of Madison and Milwaulkee, except without the scenery, or the history!
Whatever you do make sure that your car has airconditioning! Summers are HOT HOT!
The spring storms down here are violent as hell, and we get our share of Tornado's too. You can leave your snow boots/shovel, and parka behind. It rarely gets below freezing here.
I hosted a JUB meet here in Dallas last year, and we've had one in Austin, Texas last month, with another planned for April, and a long weekend JUB meet planned in San Antonio for Labor Day weekend.
Drop me a PM when you get here, and I'll be more than happy to show you around. That or you can PM me if you have any questions about "neighborhoods," places to go, to live, or just to hang out.
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