Junkrat has no fucking clue how his equipment works and is too impatient to figure it out. He gets so whimpery when another shows him exactly how it works; just twitchy, coltish hips and his peg leg jerking until the person takes it off of him.
I just have the firm believe that Junkrat becomes very quiet and shy during sexy times. Like just… staring and little confused, overwhelmed noises.