Of course he's doing it on purpose! Great big brain (or so he says...), he has to know what he's doing. Well, maybe not. Supposedly, Ten didn't realize just how flirty he was and the mixed messages he gave to his female companions (except Donna; she wasn't having any of it). Or maybe he did, and no one called him on it until Martha finally got exasperated and left him, the healthiest thing she could do!