in a suitable sexual position with a (personal) first timer, stop, get a good grip and sincerely say, 'is this a bad time to tell you that I have ________(insert STD of your choice)?' Then stay in her as long as you can!!
‘God, you are AWESOME! I am so glad that you picked me up tonight.’
‘Well, I am awesome because I sleep around here and there quite a bit.’
‘Really? Shit, I never asked, you don’t have an STD do you?’
(Get the grip) ‘you like to French Rodeo?’
‘Yeah, I tested positive for herpes last week. YYEEEE-HAAAWW!’