Article by: Rumer Certeza
Photo: Fame 

Megan Fox, this generation's sex Goddess had more than she bargained for in her tiring new flick as a prostitute.

Considered by many as Tinseltown's sizzling hot sex siren of today, even the 'Fox' has her limits and will succumb to instense activity.

In her new movie entitled 'Jonah Hex,' a comic book adaptaion in which Megan portrays a prostitute opposite actor Josh Brolin, the sexy brunette had her share of physically demanding, energy sapping moments while shooting the film.

If you thought the 'Transformers' saga was hardcore, this movie has been one of the most difficult films to shoot, requiring strenous activity on Megan's part.

In fact, one of the sequences which also involved co star Brolin, demands that the actress keep her head over water for an extremely long time, draining her of all the energy. She expresses how totally exhausted she was after only five days of filming.

"It was just hard. I was out of my league. Everything was over my head. I just tried to stay alive," stresses the brunette beauty.

The actress also has her hands full with 'Transformers 3' which is set to be released in the summer of 2011.

Aww.. poor Megan. Whoever wants to wipe away her sweat, raise your hands, fellas!