Headcanon: Bruce never taught any of the kids honey trap type of subterfuge (seduction techniques). Never had any plans, never even thought to include in the curriculum, and probably for the most part forgets they know how to until it slams him in the face.
Dick, in his era, had Talia hanging around. And while Talia didn't teach him, per se, she can never suppress idle comments and such.
Jason, for the most part, was vaguely familiar with types. And when the rare need arises, he just brings to mind random actions he'd seen others -sistersneighboursbrothers- do to appease or appeal. Stephanie has a very similar experience, if only she finds use for them more often.
Tim spent a couple of years in the presence of Selina. Enough said. And it's also convenient that with his frame and general physique and mien, techniques that are used on him can easily be recycled to use on others.
