Scarlett Johansson is fascinated by men's nipples.

The 'He's Just Not That Into You' actress can’t understand why boys still have them, adding the concept of male nipples completely baffles her.

"What is the function of the male nipple? Maybe we all start as androgynous creatures and then they become men?"

Despite admitting she is confused by some aspects of the male anatomy, the 24-year-old actress' bewilderment is not strong enough to turn her off men completely.

She recently revealed she is still crazy for her husband Ryan Reynolds - who she married in a secret ceremony last September - adding she is "in love with love".

When asked about the impact marriage has on relationships, Scarlett replied: "I have no perspective on that - you should ask me in 25 years.

"I am really in love with love. I'm a lover not a fighter. I'm a real lover."