The really strange thing is that I've told them this hurts me, but they all consider their behavior to be normal. I don't see how they can say sex makes them more of an adult when they aren't responsible enough to be able to move out of their parents' home. I want to know what the big deal is, but I'm afraid of becoming cold like them. Yeah, life pretty much sucks in this respect. The sad part is that it will most likely get worse.
Sex is just the beginning.
The same thing happens when people graduate, get a full-time job, get married, buy a house, and have children. These changes in life cannot help but change the person, too. It's ironic because we look forward to these changes so much that we don't even notice how it changes us. Luckily, you don't have to live the standard life that everyone else follows. There's a lot to be said for sex and all those other transitions, but keep a watchful eye on who you are.