Onechanbara: The Movie (2008)

The female lead wears a bikini, boots, and cowboy hat for much of the film. The bikini top has goofy furry edges, though, so her cleavage is mostly obscured.

The other main female character spends the film clad in black leather pants, top, and jacket; the top shows a decent amount of her bounteous bosom.

A couple has sex in one scene. Nothing particularly revealing is shown of the male; disappointingly little is show of the female, though her breasts are briefly visible.