First of all, people are different.
Just because a woman is single, it does not means she wants a relationship right now.
Also, just because a man is single, it does not means he does not want a relationship.

And there is more:
Wanting a relationship does not makes you an inherently better person, while being a single person who just wants sex does not makes you an inherently worse person.

So, to wrap it all up... Did you guys (and girls) ever realized that all of this gendered propaganda of "women want relationships, men want sex" is a subtle way of bashing men, implying they are morally inferior to women because they don't want to be in serious relationships?