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A sex act in which one person is tied to a bed and a sheet with strategically-cut holes placed over them, through which a second person has sex with them.
"Looks like it's time to buy new sheets. The wife and I were really pushing the envelope last night."
to push it to the limit. to see how far you can go with something without getting caught.
Whoa she pushes the envelope in her risque music videos.
"stretch the limits" - to go further (in any field) than anyone or any group has done before. perhaps doing something that wasn't previously thought possible.
dude, that quadruple-backflip double-twist one-handed going backwards while blindfolded and sucking a lolly (deep breath) surf manoeuvre was really pushing the envelope.
To outdistance everyone else in an activity - set a new standard or precedent