“I take 20 mg Cialis pill and it works as expected but after sexual intercourse I sometimes feel muscle pain in the back and fatigue. I do not know if this is because I work like a stud or it is a side effect. Anyway I am lucky that I gave it a try.”

“It is not fair that everybody knows about Viagra, Levitra worked perfectly for me and moreover it is less expensive and easier to find. I almost have not experienced any side effects, at least those severe to make sex impossible. Works like a charm.”

The bacteria responsible picked up some new genetic material, say experts.

The rule is named after 13-year-old Martha Mills, whose family's concerns about her care were not listened to before her death.

From popping spots to getting enough sleep, experts share their advice on the best way to look after teenage skin.

The BBC's Catherine Burns spoke to some young mental health ambassadors who called for an increase in mental health support.