You are seeing a 25-year-old male who has presented to A&E with scrotal pain and swelling. There is a palpable epididymis on examination, and you suspect epididymo-orchitis. During the history the patient reports that he has had recent unprotected sex with someone who he believes might have had gonorrhoea and has also had discharge coming from the end of his penis over the past 2 days. What is the next most appropriate step in the management of this patient?