The 69 position, but better. The primary advantage to 69 in a sex swing vs the bed is he can move his head freely and breath. Additionally his arms will be more free to move and touch all of the right spots. As a word of caution, this is one of the positions that requires the swings to support both persons body weight, so if you really want to use this position, please check weigh limits carefully and do your research on good comfortable swings.