The do-that issues
Well, everyone is aware of Ryan and Marissa's sexual insinuations throughout their conversations. Marissa's first word ever to Ryan being 'bum' and her famous 'Let your education begin' are sticked in memories for our greatest joy. What is less accurate is the sexual context of Seth and Summer.
Summer is, as a 16-years-old girl, obsessed with sex. Refer to her pushing Marissa into Luke and Ryan's beds or to her giddy up mime to know what I mean. She is constantly talking about it.
Summer is obviously the strong one between them. And her natural authority /bitchy character, influences Seth a lot. Summer first took notice on Seth at the Vegas party when she superstitiously asked him /shouted at him shall I say, to blow on her dices. Seth, hardly believing his icon of perfection was asking him to do such a sensual thing as blowing on her hand, has some difficulty to do it before deciding to have it as a full-time job. Well, before Summer decided for him that he would be her personal rabbit foot.
Would that be all, the indulgent tv watcher /me, wouldn't be shocked and would allow Summer the benfit of the doubt cause she's a young teenager not well aware of grown-ups life. But Summer is not stopping there. Noticing the power she has over Seth, she takes a step further and genuinly covers her finger with piquante. Ensues the famous 'Lick it! scene that still makes me choke with emotion. On how Summer /we learn that Seth Cohen can lick things in a very sensual way.
Their further interactions include bed sharing and naughty nurse playroles. The result of all those sexual attempts is the necessary nervous breakdown of Summer who starts being a horny girl, attacking everything /Seth with her lips. May her sad story be a model of the the danger of being a pervert in the OC. Or the illustration of the benefit of being pushing with Seth Cohen...