ARE NIPPLES OFFENSIVE?

Yesterday we took a pole up to Victoria Park to enjoy the hottest day so far this year by dancing, sunbathing and taking photos. I snapped these gorgeous photos of Camelot and Zoonii however as we were talking about whether I can even post these cover-free or not, a man "offended" by their pure nudity called the police after initially staring for ages. With the police officers being somewhat understanding, it was all resolved by them having to cover up.  

However, the question remains, are nipples offensive?

If yes, first of all, why?

And why isn't the same applicable for men?

Stop overly-sexualising or bodies to the extent that our freedom depends on your eyes.

All shot with Canon 6d + 50mm.