In which season Ryan and Marissa have sex?

Season 3, episode 3 - The End of Innocence.

in the third season, when they think marissa is going to leave for hawaii so ryan makes an uber romantic hut on the playa (using the hut from the school play, which seth and summer steal) and...they have sex there. its so cute and romantic and i wish marissa didn't die :(

Season 3

season one

season (3)

Season 3

In season 3 (;

season 3