Massage table can be great. Height is typically good for multiple types of activities: Standing sex, daty without having to contort this old back of mine, etc. Finally, since it does not give like a bed, pounding sex can be very hot.
I really haven't tried couches, chairs, and other furniture lately, nor have I tried a countertop lately, but all have their place in a sexual escapade.
I would rather have a blanket or towel on the floor than an air mattress. To hard to stay balanced on the air mattress. Only thing the air mattress is good for perhaps is NURU.