In the movie the Virgin Suicides?

Question

Does Lux have s*x with Trip, and other boys? And how does she kill her self?

And why does Trip leave her in the oval?

Answer 1

From what I recall, Lux has s*x with Trip, and after he abandons her emotionally and the oval after longing for her, and even he is not sure why, does she try to engage in s*x with any man that comes to their house, thus s*x with the cable guy on the roof, but likely out of anger because she knew Trip would watch because she knew on some level, he was obsessed with her.  

Lus orchestrates the suicides with her sisters in the garage by leaving the door closed and turning on the car.

Answer 2

Yes she has s*x with different guys on the roof. I don't really remember why he leaves her there. She kills herself in the car while the boys are inside finding the other girls.