cause they not ready yet to have responsibilities in life.
They can get sex without marriage more easily than in time past
They can enjoy the benefits of having a wife by cohabitating rather than marrying
They want to avoid divorce and its financial risks.
They want to wait until they are older to have chldren.
They fear that marriage will require too many changes and compromises.
They are waiting for the perfect soulmate and she hasn't appear yet.
They face few social pressures to marry.
They are reluctant to marry a woman who already has children.
They want to own a house before they get a wife.
They want to enjoy single life for as long as possible