@Nigee, I think people are "making a fuss" about sex because sex, like all actions, has consequences - often very major consequences, possibly even lethal consequences if you think of AIDS. Or instead of dying, you could create a life, and then whatever you do about that will have major repercussions for the rest of your life. Or as Dipplayer pointed out, you could (will) have relational repercussions for years to come, whatever those consequences may be. At any rate, it's kind of obvious that sex is a big deal to humans, so why not give it the attention it deserves?
As to people having "psychological hangups" or being "rubbish in bed" when they get married I can only give my personal experience which is that if you are a virgin and you marry a virgin then you're both rubbish in bed, but neither of you knows it, so it's not an issue. You learn together, knowing that you'll never get a disease, never fearing pregnancy, knowing that your partner is never thinking about someone better they had long ago before your hair started greying and your six-pack abs started turning into more of a keg. You know the person you make love to is always going to be there in the morning even if you have a giant fart after sex. And the more you practice together the better and better you get, and the more and more you want to do it, which is fine because they're always there. And I could go on and on about the joys of wedded love-making, but maybe I've shared too much already. But I wanted to demonstrate that I'm not anti-sex or some such insanity.
If you want a long-term outcome you usually have to make long-term plans. What do you want your sex life to be like when you're FlemGem's age? Or his dad's age? (Yeah, FlemGem's dad and mom are still getting it on, and making sure their kids know. Sheesh.)