I have always held the opinion that as a woman, do not have unprotected sex with a man you are not legally married to, to avoid unwanted pregnancies. If you are a woman, if you don't know a man's house and a member of his family, do not have sex with him, (refuse every temptation to have sex in a hotel). If you are in a sexual relationship, have it at the back of your mind that it might not to lead to marriage, this will prepare you mentally in the advent of a break up.