Thats no fun.
lol
If you think promiscuity is fun, you obviously haven't experienced sex in a relationship that both people are committed to for life. Sure, sex outside of marriage is fun, and feels good physically, or at least you can convince yourself it is and does. But sex inside a committed relationship is deeply satisfying not only physically, but emotionally, mentally, and spiritually. People (and I have the experience to speak to this) who have sex outside of a committed relationship, specifically marriage, do not have any idea what they are missing.
Not only that, but I can also tell you that there is plenty of baggage that is taken into a marriage when you have been promiscuous, and it takes a long time to overcome it. I will probably always have reminders that come back to haunt me from time to time. I am thrilled and deeply thankful that my children (who are old enough to make this decision) are committed to abstinence until marriage. Don't think that you can have your fun and then go into a committed relationship and have the same experience as someone who saved themselves for marriage. You cannot have the best of both worlds.