Both of them involve the swapping of body fluids, for one.

( Anders smiles slightly, in the way that he used to do when Nathaniel would ask him a question and Anders would response back with a quip. If nothing else, it shows his mood's starting to lift a bit. )

And if you do it right, it should be just as enjoyable as kissing. Maybe even more so. ( He doesn't know if spirits can get aroused, but sex can be plenty fun even when you're not the one getting off. Anders' smirk fades a little before he asks, )

Is this something you're actually seriously considering?