Scripture to back which bit up?
If you mean me thinking that pursuing marriage (plural or mono) to satisfy one's ones desires being doomed to fail, well, that's not a direct biblical thing. I could find some scriptures that apply (Galatians 5:14-18, Ephesians 5:25) I guess, but I just feel marriage is a long haul kind of thing, and if your reasons for getting into it are selfish, then those reasons won't hold up. If your reason is to get with a hot girl, she'll age. If they're to get unconditional love, well, you'll annoy your spouse at some point.
Actually, I went ahead and looked around a bit to see if there was a better scriptural basis, and here you go:
James 3:16 - For where you have envy and selfish ambition, there you find disorder and every evil practice.
2 Timothy 3:6-9 (speaking about lover's of self) - 6 They are the kind who worm their way into homes and gain control over gullible women, who are loaded down with sins and are swayed by all kinds of evil desires, 7 always learning but never able to come to a knowledge of the truth. 8 Just as Jannes and Jambres opposed Moses, so also these teachers oppose the truth. They are men of depraved minds, who, as far as the faith is concerned, are rejected. 9 But they will not get very far because, as in the case of those men, their folly will be clear to everyone.
Philippians 2: inclusive, but especially - 3 Do nothing out of selfish ambition or vain conceit. Rather, in humility value others above yourselves, 4 not looking to your own interests but each of you to the interests of the others.
If you meant some other bit... well, then I guess I blathered on for no real reason, lol!