It's mainly just Jay that talks about sex... Simon is more of a hopeless romantic and so is Will. Neil talks about sex when it's relevant but most of the time he's just in his own zone. I don't see how you think it's all sexual. I mean there are some episodes where the plot is all about a girl but for the most part it's about the lads and their wacky adventures. Also, the topic of sex just comes up because in high school, the 'tweeners are the guys who are desperate to lose their virginity so if the show was realistic then every episode would be a plot to get laid lol.