I need advice please don't judge me. I am a 22 year old male and my sister is 18. We are very close. Recently we have become even closer and we kissed each other passionately. Too cut a long story short my sister says she loves me and wants to be in a sexual relationship with me, I also feel this way. I want to know what the risks are of having sex with my sister. If we do it we will use contraception, is this enough?