You had had one too many, and your eyes met across a crowded room. Next thing she was asking you what you wanted for breakfast. But, there are things you should never forget, not even in the heat of the moment.
Take action:
Make sure that you never have sex without a condom; have yourself and your long-term partner tested for HIV; remember that cheating on your partner puts both of you at risk, so don't do it; alert any of your previous partners if you contract an STI; remember that unwanted pregnancies can cause a lot of trouble, so don't forget the contraception.