You want to be going up and down, and slightly back and forth, at the same time. If you’re bigger built than your top, or if you’re a bigger guy in general this one can be tricky as gravity is against you. Be careful not to crush the chap under you or he’ll be at risk of losing his erection.
If you’re both standing up – and you may well be if you’re f**king in a sauna, sex club, dance floor, kitchen, etc, bending over for a top, or bending someone over, can be a winner. Whether this is comfortable or not for the bottom will depend on, you guessed it – angles.