Shia LaBeouf thinks Rosie Huntington-Whiteley was better suited to the 'Transformers' franchise than Megan Fox because of the sexiness of the series.

The Victoria's Secret model has taken on the lead female role in the latest installment, 'Transformers: Dark of the Moon' and her co-star believes her modelling background made her more comfortable with director Michael Bay's vision than her predecessor.

He said: "Mike films women in a way that appeals to a 16-year-old sexuality. It's summer. It's Michael's style.

"And I think Megan never got comfortable with it. This is a girl who was taken from complete obscurity and placed in a sex-driven role in front of the whole world and told she was the sexiest woman In America. And she had a hard time accepting it.

"When Mike would ask her to do specific things there was no time for fluffy talk. We're on the run. And the one thing Mike lacks is tact.

"Rosie comes with this Victoria's Secret background, and she's comfortable with it, so she can get down with Mike's way of working and it makes the whole set vibe very different."

Shia believes Megan's "empowerment" made her feel "awkward" about being praised more for her looks than her abilities in the film series, so can understand why she didn't want to continue working on the movies.

He added to the Los Angeles Times' hero Complex blog: "Megan developed this Spice Girl strength, this woman-empowerment [thing] that made her feel awkward about her involvement with Michael, who some people think is a very lascivious filmmaker, the way he films women."