that deserves big paragraph outlining all the morally wrong things they did including basic lack of respect for human life, subordinate position of women, etc etc etc. Or you mean scientific and art stuff? Even for that, price tag is a bit too high IMHO.
As someone that's done the co-habitation thing, I can see both sides of the issue. It's most likely a far healthier lifestyle emotionally to not do it for long, if at all.
The whole thing is quite complicated to me. I'm not sure it's necessary to remain a virgin until marriage, or even if that's best. However, I do think that it's probably best to get married ASAP if you're going to be living together.