Think of it like when you are blindfolded. You kinda anticipate what you're gonna feel when you're watching her. When it's under the table you don't know when she is gonna stroke, or when she is gonna take you in her throat. It's kinda like the feeling is heightened. Also when you're laying on you're stomach its a different sensation. Most ladies or venues that have this put a mirror in a position that you can see what she's doing under the table if you want to take a look.