The ‘Designer Vagina’ is fast becoming one of the most popular cosmetic surgeries performed. But why, and is it something you really need? Heather Stephen investigates. Sharon Osborne has admitted to a vagina tightening op and reality star Gemma Collins talked about her own very personal surgery on national TV. But the statistics show it is not only celebrities who are putting their privates under the knife. Although private hospitals are not obliged to keep figures, if you log onto the search engine Whatclinic.com you will find 141 clinics around the UK advertising vaginoplasty or labiaplasty surgery. And even under the…