blanket sex
travis and allie were shifting conspicuously underneath the blanket but everyone knew they were prudes, so dave deduced they were having blanket sex
an action occurring beneath a blanket that appears to be sexual in nature but is really mundane or innocent
"travis and allie were shifting conspicuously underneath the blanket but everyone knew they were prudes, so dave deduced they were having blanket sex" What is the definition of "blanket sex"?