What you are describing is a function of the relationship elevator, where the objective is not so much to find the right person, but to take whatever relationship you have up to the next level, leading to marriage, children, and white picket fence. Women in particular are conditioned to seek this, although men are as well. The focus then becomes not whether this person is who you want to spend your time or your life with, but how you can get them to go to the next level of the elevator with you.