The work of Birmingham’s Whittall Street sexual health clinic is the focus of a brand new observational series exploring the relationships and personal lives of patients – warts and all.

"The Sex Clinic" is a three-part Channel 4 documentary unpicking the sexual habits and relationships behind a near-100 per cent increase in the number of people visiting sex clinics in the last five years.

Whittall Street, run by University Hospitals Birmingham NHS Foundation Trust (UHB), is the UK's second busiest clinic behind Chelsea and Westminster Hospital NHS Trust.

The 80-strong UHB team welcomes through the door 41,000 patients every year. Herpes, chlamydia, HIV, gonorrhoea and pregnancy-testing - this team's seen it all. The staff know only too well how patients are not restricted by age, culture, race or sexual proclivities.

In Episode one of three, to be shown at 22:00, 11 April 2013 on Channel 4, Anthea rushes to one of the London clinics after getting worried that she’s contracted HIV after a condom burst during a one-night stand. Wayne has a wart removed from his penis but soon finds himself back in the clinic after unwelcome news from a new partner. Dominatrix Mistress Jezebel visits a clinic and strives to make sure she doesn’t come into contact with infected blood from a regular client who likes to play rough, and finally, Bompinge has a difficult phone call to make to an ex-girlfriend when he arrives at the clinic with some uncomfortable symptoms.

Meanwhile, transgender escort Tomisha and her pre-op friend Damien visit London’s busy Soho clinic for instant HIV tests and are faced with some difficult questions about their sexual behaviour.

The series is produced by Friel Kean Films. Episodes two and three will be broadcast on subsequent Thursdays at 22:00 on Channel 4.