Even after Clark comes back from the dead and he and Bruce start working together, there's a lot of tension between them, and when they fuck, it's usually rough and angry. It takes them months, if not years, until they're actually tender and gentle with each other (can either be just one time, or a slow build-up of increasing gentleness). While still being emotionally constipated idiots who sure as hell aren't going to talk about why they've started being nicer to each other.