As a practicing Catholic, no offense, but you're way off base. The point of making things like sex, gluttony, etc taboo is that it's a pleasure that you're putting above God that detracts from the worship of him. In many western societies people tend to think "victimless crimes" are of no consequence. I'd also like to point out that you seem to be working off the assumption that there is no God. If in fact you were operating under the assumption that there is in fact a God or deity, etc. simply this higher order being commanding it is enough to follow his word.
I would also say that on a personal (non-religious) note, I (and many others) consider sex a highly personal and special act that becomes less so the more people it's done with. Valuing modesty isn't such a bad thing, and I believe that being select about who you have sex with makes it more valuable of a gift to share with someone.
According to your religion you should not have sex for pleasure , whoever you have sex with ,or that's called luxury. The only purpose of sex is procreation. So there is no value in sex other than making children , and if you are doing it for pleasure it is a sin. ( i dont mind what you are doing , that's just what the catholic church says ).
That's actually a common misconception. The church teaches that for sex to "whole" it has to have both the formative (pleasure/love) aspect as well as the procreation aspect. You can certainly procreate outside of marriage (in the literal sense. This is also why they teach against birth control even for married couples. Only in marriage, with the purpose of child bearing is sex "whole".
I would also say that on a personal (non-religious) note, I (and many others) consider sex a highly personal and special act that becomes less so the more people it's done with. Valuing modesty isn't such a bad thing, and I believe that being select about who you have sex with makes it more valuable of a gift to share with someone.