You probably know that when you want to fuck on a table or in a fuck swing and it doesn't fit so well from the height - annoying when the lady was served so appetizingly beforehand. In this case, the user couldn't fuck me well on the swing (we tried it anyway - looked good, but wasn't possible for long), but a blowjob and a heavy throatfuck was possible. That's an alternative that you can live with;)