But most of the time that's because women have feasted from ages 16 - 22, and get tired of meaningless sex. If a lot of guys had the same period where they could sleep with pretty much anybody they wanted to, and have it in their back pocket that they continue to do so if they wanted, I truly believe many of them would require more from women as well.
People underestimate how much circumstance plays into our desires. Like we really think a woman who had attractive men willing to please them at the push of a button for a long time, is going to be mentally anywhere near some dude that has had continuously improve himself, meet tons of people, and take dozens of shots just to get a sniff of some chicks that aren't even really what he wants.
When their mentalities are different, it's because "Women are this, and men are this". Maybe it isn't so much their gender as it is what the two different people have gone through.