Dear Sukhwinder... Please learn to think and not just blindly ape & gape at conventions. Always remember that conventions are not made for rigid and blind following but are more as per the need of the times and its perfectly human to re-evaluate them and re-apply them with present needs. the origin of marraige for your very kind information was nothing but plain and simple legalisation of sex so as to restrain the weak & loose minded from running amock in the society... the saat pheras & shlokas followed afterwards to add some more sanity to this process and drill down the meaning further in the in those minds that just can't understand the meaning and significance of human relations unless they are quoted and bound into a set of rules.....grow up sukhi...its high time!!
