It would seem that marriage isn't a risk that needs to be taken. If you're living with a guy with unlimited bedroom fun already, what is to be gained? If you're in such a situation, then he's never gonna marry you because he already has everything he wants. Why buy the cow when the milk is free? This is extremely common among young people as the "next step". But in "reality", this isn't a next step, moving in together and cohabitating is the major "commitment" and for all intents and purposes, you are already "married". So you might as well have a party and put a ring on it. However, I think that the vows you say ought to be updated to something practical. We should remove the "death do you part" with we will be exclusively together so long as we are happy and love each other. To expect "forever" is to try to predict the future which cannot be done. If the guy is worried about legal entanglements, then just don't tell the government about it and just "say" to yourselves you are committed and "married "and keep your finances the same as with cohabitation. Some countries are now allowing that. Between any 2 adult individuals, anything is possible, don't let society or the government dictate your behavior. But yeah, marriage is at a historic low and as long as men can get everything they want out of a relationship without marriage, I don't see this getting any better.