It's that simple. One of the boys discovers that true love can transcend his quest for meaningless sex. But this healthy message is drowned out by all of his friends finding immense satisfaction in their own sexual escapades. Oral sex is shown being given by both a boy and a girl. One scene in particular is profoundly suggestive.
Masturbation is shown frequently.
A teen girl strips down to her panties in Jim's room and touches herself. Unbeknownst to her, Jim has set up a camera which links live video of her actions to the Internet. Extended screen time is devoted to showing the girl's bare breasts. All of this is watched on the Internet by the majority of the high school. Then they break up.