Temporary Mariiage

These days lots of discussions are heard in different websites and newspapers of Iran about the legitimacy of temporary marriage. I think for foreigners it's not clear but from my view it's exactly same as those illegal affairs in other countries which is made out of the poor wealth condition of the women in most of the times.
Our governors (of course MEN) are advertising of this way of sexual affairs as a way of controlling those youth who can't have permanent spouses!!!
This is the most ridiculous idea which I've heard recently. There are certainly lots of bad results after having this connections. One of them can be the number of unwanted pregnancies which will increase in this case. Of course those people who do this action are not looking forward having children and because they won't have any training about prevention ways, so the amount of abortion in not official centers will be increased.
In the USA ,which is an open minded country in these subjects and always lots of training are done about preventions, about 56% of pregnancies are unwanted. Compare this amount with 75% in Iran( ! ) and think about illegal ways of abortion which will result into 25% of mother death in Iran. All these comparisons doesn't have any conclusion except sorrow and sigh for our Iranian women.