Why waiting to have intercourse is sensible You might hear a lot of messages suggesting that its a good notion to have sexual intercourse, from tracks in the radio to talk in school. You may feel interested in sex or have strong attraction to some body. Choosing to have sexual intercourse is just a deal that is big however, so think it through. You might ramp up having a pregnancy that is unplanned. You might like to get an STD, or std (also called an STI, or sexually transmitted infection). Having sex before youre prepared can hurt your relationship seriously as well as your emotions.