I'm a quadruped, so mounting up from behind is an obvious favorite. So's mounting the front end, come to think of it.

Laying down and spreading my four legs to let them go at it is another fun way to get intimate.

I've humped upwards from my back as well, but I'm not very good at it, and it doesn't feel as nice as a more traditional mounting.

And there's always something nice to be said about laying down and spooning... both for lewd purposes, and just to cuddle with a nice warm cutie.