We live in a messed up world. A six year old boy was recently sent to the principal's office for kissing a girl on the hand, something that used to be considered quite a gallant and gentlemanly gesture. Yet, rap videos that exploit and demean women are still freely shown on TV.
Sexual harassment is any lude comment that has to do with your breasts, private parts or sexual activities. It also of course includes things like unwanted kissing and touching.
Sexual intercourse should only be engaged in by one man and one woman who are married to each other. This is part of God's original plan for human beings as outlined in the Bible.
Activities like oral sex should not be participated in at all because they are called "unclean" in the Bible.
It is OK for unmarried people to engage in things like kissing and touching. However, it is best to wait until you and the guy have been in a serious relationship for a while and know each other well. (Of course, a gentlemenly or ladylike kiss good night are acceptible at any stage of the relationship.)