I'd revise your statement to not being confined simply to Islam. I think it's the case with any religion.and I'd disagree with nighty, my parents just told me about Islam, I had to find it myself, you can never be a true muslim if you are forced to it. Nor force others to it.
It is a more cultural thing aswell, and the boy/girl are allowed to have personal conversation so they can understand their new life partner. They may agree or disagree.
Follow your balls and not your brain.
Sorry if i caused offence with this comment. I don't see how in any way it is disrespecting any religion but if thats the way you take it then fine. Sorry if i caused any offence it certainly wasn't intended.