I’ve never used a vac-bed or similar but can understand the appeal. Haruhiko Kawaguchi went for a similar effect, along with some artistic flair and breath play, when photographing couples he met in Tokyo nightclubs:

“…He arranges them like pieces of meat inside bags meant to store futons and blankets. He then seals their conjoined bodies inside the bag using a household vacuum that sucks out all of the air. For this project, Flesh Love, he’s photographed over 80 couples. Kawaguchi says the men panic more often than the women. A few have struggled for air while in the bag and one man ended up pissing himself. The women just want to look good, he says.”

More at featureshoot.com.