This is true. Not everyone is looking to have a "serious relationship" or get married every time they go out on a date. There is nothing wrong with just having fun as long as the other person understands where you are coming from.
Most serious relationships come down to strong emotional feelings for one another and (timing). Not many 20 something year old guys are in a rush to emulate their parents!
As far as a man's "list" is concerned the basics rarely change whether he is looking for something casual or long-term.
The first thing a man seeks is a woman (he) is physically attracted to. If a man thinks a woman is ugly he won't ask her out. The next thing most men look for is an easy going/pleasant personality with a great sense of humor. Anything beyond that is icing on the cake!
Only in novels, movies, and mail-order bride scenarios have I ever heard of men who (seriously) proclaim they are "looking" for a wife. Most of us just end up marrying someone who we have been involved with. It's far from being the fairytale most women imagined having.