Ariarne Titmus spoke out against a sports betting advertisement.

The ad featured actress Sydney Sweeney.

Titmus argued it sexualised women's sport.

The advertisement provoked a backlash.

Other elite athletes joined the criticism.

The ad promoted a sports prediction company.

As a separate matter, Titmus revealed she is engaged.

Her fiancé has been named as Mac Powell.

She wrote the word 'Forever' on social media.

The engagement news bore no relation to the ad.

Titmus's comments formed part of a public backlash.

Athletes from different sports joined in.