Aren't drive-in movies is the best? I thought they were only way out in Shelton or up in Oak Harbor (where I saw movies as a kid.)
But, there are pop-up drive-in movies everywhere - Sodo, Burien, Showare Center in Kent, Bremerton and more. And, looking at the list, most of them say you can make out in the back seat! Keep it PG!
Thanks to The Stranger for this comprehensive list - A few of the drive-ins are done for the season, so watch out for that.