Sea Level Club

sex on the deck of a boat, presumably at "sea level"

Bored with the formal tour, my girlfriend and I went to the marine bathroom and joined the Sea Level Club.

Sea Level Club by Rex Mundi 3 September 30, 2008

At Sea Level Club 

Similar to the mile high club in all ways except that this club is joined while on a cruise ship.

Wow the cruise was amazing; my girlfriend and I finally joined the at sea level club. This time we truly did move like the motion of the ocean!

At Sea Level Club by ynE October 9, 2008