Yes, the height of the bed does matter. The penetrating partner might not be able to stand tall doing this one - and if that's what he wants, you might think: kitchen table. On the other hand, if kneeling doesn't quite raise him high enough, he'll need a few cushions and phone books Caveats aside, this is a truly inspired variation on the basic face fuck.

It's easy to achieve, height of bed issues aside. The partner being penetrated lies back, his head falling over the bed's edge. He opens wide and relaxes, then the top, as we might as well call him, does his thing.

The main advantage is that, with your head angled back, you can be penetrated deeper without the feeling that the back of your throat is being pummelled. It's relatively easy to relax in this position. Plus which, each partner gets a great view.

There's one catch: if the receiver isn't relaxed, the gag reflex might set in. In this case, he should try yawning, to relax his mouth and throat, and stroking himself, to relax his body. He should probably not try to talk.