What are the sexual themes in assassins creed 2

There is a scene with altair (from AC1) that shows him following a girl to a tower, and spending the night. Nothing is shown, in fact they remain fully clothed.

However, in the beginning of the game, Ezio visits a girls room. If the correct buttons are pressed during the cinematic, the characters proceed to take clothes off. The scene fades to black before you see anything too racy, but the theme is definitely there.

Also, later in the game, Ezio flirts pretty heavily with a mature woman after saving her from an island. There's definitely innuendo there as well.