Bet your foreplay is great. *smoochy smooch, oh can you please wee on this stick and I'll have to get some blood before we touch each other, smooch smooch*.
Get down to your local sexual health clinic, they will have a drop-in day. Take a book, as you may have to wait a while. They'll want you to **** in a cup and take some blood. You'll then phone up an automated line a few weeks later and told of the outcome. If you are diseased, you will be able to pick up a prescription from your GP and get treated.