Of course, the idea of "how do you know the shoe will fit if you don't try it on first" in regards to marital relations is a primarily Western mindset. This is something many people don't seem to understand.
A very large number of eastern cultures still practice arranged marriages. Before you all start gasping about how horrible that is, just consider the way they think about marriage.
We here in the west have romanticized marriage so much that it's set onto a pedestal of love that no one ever reaches. People think that you should only get married if you truly and fully are flipped head over heels in love with that person, such a love that can only be undying and that will remain in you until you die. Get real.
You don't even need to be in love to make a marriage successful. Eastern culture is evidence enough for this. I have a friend who's parents were born and raised in India. When she asked her mother if she loved her husband, her mother's reply was "of course I love him, he's my husband."
You see, sure, it would be wonderful and great if every marriage started out with a couple who were so far gone in love that they couldn't walk straight on most sunny days, and it would be great if every married couple was completely and entirely compatible and a perfect match for each other. The reality of the matter is that nobody is likely ever to meet their perfect match, and even if they could, that wouldn't guarantee a successful marriage.
It has been said many times in this thread already. Marriage is about commitment. Marriage isn't about being "in love" with your partner. Marriage is about "loving" your partner.
"Trial marriages" are a complete contradiction to the way real marriages work. They cater to a fantasy. The only perfectly faithful marriage partner is God. It is Jesus Christ to His bride, the Church. He is the perfect model, for despite how many times we fail, how many times we are unfaithful to Him, He will always remain faithful to us.
And of course the Church, in her great wisdom, has taken steps to deal with the problems of divorce, and it has nothing to do with "trial marriages." No, instead the Church recommends at least two years of dating before getting married, so that you have time to understand each other's viewpoints about important issues, such as child-rearing, or religion. For the sake of a stable environment for the child's development, couples should be in agreement in those important aspecst of life (and, if the couple can overcome their own selfishnesses, full agreement would be ideal). So, two years dating is recommended. Furthermore, the Church provides marriage courses which the couple is asked to take part in prior to getting married. These courses help the couple to understand major issues that arise in marriage, as well as bring to light any major issues that the couple might have with each other that they didn't even know they had.
Trial marriages are unacceptible. (<<period)