Investigating　the　relationship　between　attention-deficit/hyperactivity　disorder　(ADHD)　symptoms　and　impulsivity　will　benefit　our　understanding　of　the　concept　of　problematic　pornography　use　(PPU),　and　revealing　predisposing　and　malleable　moderators　of　PPU　will　be　beneficial　for　its　prevention　and　intervention.　The　current　study　not　only　aimed　to　observe　these　relationships,　but　also　explored　the　potential　moderating　role　of　physical　exercise　in　the　general　population.　A　total　of　600　Chinese　adults　(Mage　=　32.31,　SDage　=　12.40,　39.8%　women)　were　recruited　and　completed　an　online　survey.　The　results　showed　that　participants　with　regular　exercise　scored　lower　than　those　without　exercise　on　ADHD,　impulsivity,　and　PPU　(all　ps　＜　0.001).　Using　latent　moderated　structural　equations　(LMS),　the　findings　revealed　that　the　relationship　between　ADHD　symptoms　and　PPU　was　mediated　by　impulsivity,　and　physical　exercise　moderated　this　relationship　(B　=　−0.14,　p　=　0.048).　Specifically,　when　individuals’　physical　exercise　was　higher　than　0.84　standard　deviations　above　the　mean,　the　positive　predictive　effect　of　impulsivity　on　PPU　was　not　significant.　These　findings　indicate　the　important　role　of　impulsivity　in　the　relationship　between　ADHD　and　PPU,　and　physical　exercise　could　be　a　meaningful　component　of　interventions　among　individuals　experiencing　PPU.　©　2022　by　the　authors.