Don't worry. It's not pornography.
It's shot in black and white, so obviously it's art.
In a second ad, titled "Windowsill," in which the blonde is writing a note while the guy removes her camisole, the pen is similarly superimposed but situated in such as way as to suggest either:
1.) Verve. The Sexy Pen, or
Impossible to tell what exactly she's writing, but we're guessing: "Oh, God! Oh, God! OH, GOD!"