Questions　remain　regarding　how　best　to　define　problematic　online　sexual　activities　(OSAs)　and　about　paths　that　may　lead　to　problematic　use　of　OSAs　and　their　consequences.　Although　frequency　and　duration　of　use　and　motivational　drive,　as　expressed　through　craving,　to　view　pornography　have　been　implicated　in　problematic　OSAs,　their　inter-relationships　warrant　direct　examination.　We　propose　and　test　a　model　by　which　pornography　craving　may　promote　more　frequent　engagement　in　OSAs　and　more　time　spent　engaging　in　OSAs,　and　this　may　lead　to　problematic　OSAs　and　subsequent　negative　consequences　like　negative　emotions.　Data　from　1070　college　students　suggested　that　20.63%　of　students　were　at　risk　of　problematic　OSAs　use,　and　this　group　had　greater　frequency　of　OSAs,　more　usage　time,　higher　pornography　craving　and　more　negative　academic　emotions.　Our　proposed　path　model　was　partially　supported.　Pornography　craving　was　associated　with　problematic　OSAs　use　more,　so　through　frequency　than　quantity　of　OSAs,　and　OSAs　were　related　to　negative　academic　emotions.　Future　studies　of　problematic　OSAs　use　should　consider　the　complexity　of　relationships　between　craving,　use　of　OSAs　and　negative　health　measures　in　college　students　and　other　groups.　©　2019,　©　2019　Taylor　&　Francis　Group,　LLC.