The Tantra Chair is amazing. Sex swings are fun. Saw one of friends fall out of one...good times, lol! Edge of the couch is good for grinding stripper lap dance style...modified ACG. I think the bed is best... king size preferably!
Tied face down on a liberator pillow.... Now we are talking. I love rubbing lube/oil all over a woman's backside. I could see this idea requiring lots of time, lube, toys and covers......