Well, when it's something special, you don't go giving it to everyone you *think* is special, do you? You keep it for one person and one only, and then with much careful thought and caution. Like, say, the grandmother you're close to who has died gave you a ring to keep, or something, or a letter, or some such memoto - you won't go lending your ring to just anyone who asks, and you won't let just anyone read that letter, would you? Or when you're with your bf/gf - you won't let anyone touch your partner or let anyone kiss them and would probably get jealous if a person of the opposite sex to your partner constantly hugged him/her. and etc. When you really care about something, you don't give it away easily. This of course has a lot to do with maturity too. And so giving your body away in sex "just for fun" - you're disregarding what effect it could have on the person you're having sex with, and you're being careless with how it might effect yourself afterwards. And you're saying - my body can be given away for fun. If you truly valued something, you do not just give it away "for fun", and not just to anyone either. So in that, if you have sex with just anyone for fun, you degrade yourself and you degrade the person you sleep with. And it also shows a level of immaturity. In other cases it might show the person to be trying to search for someone who loved them, but they think by giving themselves away in sex, they would find that, and sex helps them fill this void that they have. But it doesn't because afterwards it becomes empty and you're out trying to find someone else to fill that void. You're chasing after an illusion that would cause you to get more and more hurt without your knowing. If you truly valued yourself, why would you have sex with just anybody? Why would you pull some random stranger just cus they looked good and the next day, they would forget you and you them? It goes to show you do not value that person and they do not value you. So why give away something so valueable to someone who will not treat it right and cherish you as you deserve?