Casual sex has increasingly become acceptable with shows like Sex & The City, Nip Tuck and more recently, Channel 4's Sugar Rush pushing the envelope further than most contemporary dramas. But with this more liberal attitude to sex on TV, comes a more liberal attitude to sex off-screen and with that, an increased risk of sexually transmitted infections.

Latest statistics from the Health Protection Agency show an increase in the diagnoses of all types of STI since 2000. There has also been a concerning rise in the rate of infection in every age group - from the under 16s to the over 45s. Instances of certain STIs, pubic lice (or crabs) for example are even expected to double between now and 2010. So why has our increased openness about sex failed to translate to an increased awareness of the possible dangers of casual sex? Why are we still seeing a total lack of willingness to face the facts? One reason might be the continuing levels of ignorance amongst all age groups and a lack of understanding.

With National Orgasm Day on the 31st, the UK will be gearing itself up to celebrate all things pleasurable but this day also provides a timely reminder that we have a responsibility to protect our partners and ourselves. A visit to your local GP, GUM clinic or pharmacy won't cost you a penny and so make sure you face facts and seek advice. Treatment is often quick and simple, crabs for example can be treated with a simple application of Lyclear Dermal Cream which can be picked up from your local chemist.

Dr Mike Smith joins us live online on 28th July 2005 at 1pm to answer your questions on sexual health.

Dr Mike Smith is a member of the National Association of Family Planning Doctors and the Institute for Psycho- sexual Medicine. He was voted the TV-&-Radio Doctors' 'Expert's Expert' in the Observer Magazine's series of that name.