#PantyChallenge: Why women are sharing pictures of their underwear online

If you're an avid Twitter user, you may have noticed a new hashtag trending in your timeline.

The #pantychallenge is being discussed by people all over the world, after women began posting pictures of their underwear to their social media accounts. The reason? To prove that their pants were 'clean' - i.e., with no vaginal discharge on the fabric.

Unsurprisingly, backlash against the hashtag began almost instantly, with many referring to it as 'awful' and 'shaming'. 

'#pantychallenge is awful and once again making girls feel bad about being healthy,' one user wrote, whilst another added 'Why do these girls think pretending online that they don't get discharge makes them better than other girls? #pantychallenge'