Whatever you believe, just know that you're doing it to yourself and no one else is doing it. My advice.
I feel like.. it doesn't mean as much to people as it used to. The care for the meaning is slipping and I think that's kinda sad. I'm catholic myself so I've been taught what Lost is saying for as long as I can remember.
Sex is apart of like and should take place after marriage. However, in the society we live in, sex is happening everyday. I say if you plan to have relations, make sure you are mentally and physically ready to accept all consequences. Also be safe. Too many diseases are floating around.