Well to my knowledge the furthest Sophia has gone on the Filthy/straight route so far has been to remove her panties (the last restaurant scene with Bennett), and even that was under duress, not any type of lustful urges. And that was in a place away from (aside from Bennett) her work colleagues.
If by "extreme", L&P means anything that would risk Sophia's job, then even a bj/hj would be far too extreme. Anything like that will probably be limited to Dylan or Sam since they're the important characters on the Filthy/straight route. Aiden will likely end up going the way of Tyler, the museum boys, Bennett etc, who are only really there to increase Filthy points to get Sophia to the point where she would sleep with Dylan or Sam.
Zac is probably the only exception, since Sophia knows where he lives, and can do things outside the school environment. How that would affect her relationship with Alyssa though is a different question. We'll see how Sophia's relationship with Amber has changed after what she has done with Julia.