Related Clues:

• Sighed sounds
• Runs smoothly, as an engine
• Sounds from the masseur's room
• Stomach muscles
• Sounds of relief
• Massage reactions
• Engine sounds
• Sounds from spas
• Sounds from a sauna
• Physical responses?
• Soothing sounds
• Runs smoothly
• Massage reactions, perhaps
• Contented sounds
• Sounds from the hot tub