Do you know what you're sharing your bed with? With over 25 different sexually transmitted infections and infestations out there, 1 in 10 of us will pick up an STI at some point in our lives. Julie's one night stand led to months of pain and embarrassment; Jason agonises about telling his girlfriend he's picked up an infection; and Matthew, a senior STI nurse, reveals that he and his colleagues don't always practice what they preach.