This thread is just full of stereotypes and youngins who had "no sex til marriage" instilled in them and probably won't end up living up to that.
Not gonna lie, sex is great. I've had both romantic and casual sex, no regrets one bit.
If you're responsible, informed, and know of the protections, by all means go for it- but try to make your first time special in one way or another, after that...carry on