Admittedly the mentality behind this is often religious but not always! So disregarding the argument that, god says nay! Which isn't really an argument at all. Why on earth would this be immoral? Remember, the emphasis is Before Marriage, so what it is about Marriage that is supposed to magically change our entire moral code where sex is concerned?

A few arguments & counter arguments to help:
- Marriage is declaration of love ::: One can "declare" I love you without signing a little piece of paper, besides what does love have to do with sex?
- The purpose of Marriage is to procreate ::: One has the ability to proceate already, marriage changes nothing in that regard.
- Sex before marriage incourages promiscuity ::: No it doesn't, hormones do that.
- Sex before marriage says "I refuse to comit to you properly" ::: What "is" properly, and no it doesn't lack comittment, the couple want to see that they are sexually compattible so that the marriage will be a happy one.
- One can easily get pregnant or get STDs ::: Yes this is an inevitable result of having sex, marriage does not change this fact.
- Condoms go against humanities goal of procreation ::: No they don't, if I plan to have three children in my lifetime I will have at least three shags without a condom, having extra practice with condoms so that I'm good at sex does not reduce that number, contraception is more likely to get you kids than abstinence anyway. Besides, what does that have to do with marriage.
- Contraception is never perfect ::: Well duh! That's why kids need educating about the dangers rather than saying "thou shalt not shag", making them all curious and then complaining about all the teen pregnancies! I'll have you know the rate is way higher in "abstinence only" policy places! & Again, what does this have to do with Marriage!
- The good book says so ::: Yeah and?

Indeed, actually just before this continues I would also like to point out that there is a difference between love and sex, because a lot of the anti-sex before marriage arguments are based on the idea of love, which is absurd because it's a totally different issue. I Love my Mom, she has done an awful lot for me, I am very attached to her and she to me and we treat each other with a great deal of affection, just like a Husband and Wife in that regard. Love is a "level" of attachment. I feel no erotic feelings for her whatsoever, I am not attracted to her. There are a few women at my Uni whom I am very infatuated with, infatuation is a "level" of attraction. They are not really great friends of mine & I don't even know them that well, there is no affection there. So you see there is a difference. The fact that in the case of boyfriend and girlfriend and husband and wife the two concepts are combined for an even greater "need" for each other leads to confusion. My last girlfriend I felt very attached and attracted to.
But anyway, back to my origional question...(see OP)

Admittedly the mentality behind this is often religious but not always! So disregarding the argument that, god says nay! Which isn't really an argument at all. Why on earth would this be immoral? Remember, the emphasis is Before Marriage, so what it is about Marriage that is supposed to magically change our entire moral code where sex is concerned?

A few arguments & counter arguments to help:
- Marriage is declaration of love ::: One can "declare" I love you without signing a little piece of paper, besides what does love have to do with sex?
- The purpose of Marriage is to procreate ::: One has the ability to proceate already, marriage changes nothing in that regard.
- Sex before marriage incourages promiscuity ::: No it doesn't, hormones do that.
- Sex before marriage says "I refuse to comit to you properly" ::: What "is" properly, and no it doesn't lack comittment, the couple want to see that they are sexually compattible so that the marriage will be a happy one.
- One can easily get pregnant or get STDs ::: Yes this is an inevitable result of having sex, marriage does not change this fact.
- Condoms go against humanities goal of procreation ::: No they don't, if I plan to have three children in my lifetime I will have at least three shags without a condom, having extra practice with condoms so that I'm good at sex does not reduce that number, contraception is more likely to get you kids than abstinence anyway. Besides, what does that have to do with marriage.
- Contraception is never perfect ::: Well duh! That's why kids need educating about the dangers rather than saying "thou shalt not shag", making them all curious and then complaining about all the teen pregnancies! I'll have you know the rate is way higher in "abstinence only" policy places! & Again, what does this have to do with Marriage!
- The good book says so ::: Yeah and?

@ dawoel

- no sex b4 marrige = almost no sexual transmitted diseases

- sex b4 marrige = more experienced sex, better sex ..but partners may be choosier and get bored faster of poor sexpartner.

... I always suggest to my students that one good thing to do is to make a trial run with the person they are interested in getting married to--shack up for a year or two. ...

Of the two major reasons for divorce (which should be avoided as much as possible, I reason) are sexual and financial. Both, can more likely be discerned by actually going through a proto-marriage state, and then the decision to not can be made--assuming a first desire to do so by both parties.
...

Interestingly, although the probability of
first marriage disruption is higher if the
first marriage was preceded by
cohabitation, this is not the case for
second marriage; if anything,
cohabitation before remarriage may be
associated with a lower probability of
disruption, although the difference is
small and not statistically significant.