Here's the thing about casual dating in Dallas: the city has a polished, Sunday-morning public face, and one of the biggest casual dating pools in the country underneath it. Eight million people, a massive nightlife and service workforce, and a constant stream of transplants who left their reputations two time zones away. The scene is huge; it's just discreet. Nobody advertises it at brunch, and that discretion shapes where it happens.
Online, which is why, more than almost any city, casual Dallas lives online. Nightlife works for meeting people (the bar guide covers where), but a bar approach in Dallas carries social risk that a profile doesn't: this is a city of overlapping circles, coworkers, and church friends. Online, both people have already said what they're looking for before anyone says hello, and nobody's cousin is watching.

Adult FriendFinder is the honest answer. It's been the default casual platform for 25+ years, DFW is one of its biggest markets, and it solves the two Dallas-specific problems at once: discretion (profiles are separate from your social graph, unlike the apps that surface your Instagram) and distance (it sorts by proximity in a metro where that decides whether anything actually happens). Free to join and browse.
The Dallas casual pool, sorted by distance from you, free to join and browse.
Browse Profiles FreeSet your radius tight. The metro is 50 miles wide, and "let's meet up" dies somewhere on the LBJ Freeway if you match across the whole metroplex. Ten to fifteen miles keeps it real; your side of the metro has more people in it than most entire cities.
Set your location and see who's nearby right now, free to browse.
See Who's NearbyLooking for something more relationship-shaped instead? Start with the full dating sites comparison or the complete Dallas singles guide.