Recent figures have revealed that young women are most affected by sexually transmitted infections (STIs).
Published by the Health Protection Agency, the data shows that women aged between 15 and 24 are most at risk.
In fact, in 2009 around two-thirds of all new STI diagnoses were in women in this age bracket.
Jason Warriner, clinical director at the Terrence Higgins Trust, said that testing was recommended whenever somebody changes sexual partners.
"If people are in a stable relationship we advice that they have a check for STIs before they stop using condoms," he said.
"Or if they are having more casual relationships, then they get a check up yearly.
"Basically every time you change partners; or if you have a one night stand and suddenly flare up with symptoms go and get checked out straight away."
He added that the reported increase in cases of Chlamydia was in fact a sign of the success of the national screening programme due to the fact that the data will register more infections when more people are receiving tests.