Truth: From gonorrhoea to chlamydia, syphilis and HIV, if you want to protect yourself from STIs while also preventing pregnancy, the most effective way is to also use a condom each time you have oral, anal or vaginal sex. The contraceptive pill, when taken correctly, can prevent pregnancy, however, it does not protect against STIs. Myth: I’m on the pill, or my partner is, so I can’t get an STI We’ve busted some of the common myths about sexual health and sexually transmissible infections (STIs), so you can get out there and be safe, knowing you’ve got the facts in your corner. Whether you heard about it from a friend or read it on a dodgy website, believing a furphy about sexual health can come with some serious consequences. When it comes to sexual health, there are a lot of myths out there.