These young ladies look lovely and it would be natural for a young man to want to find himself in their good graces so to speak. The motivation to serve God however is meant to come from our own relationship with him rather than as a means to satisfy our basic human needs or to impress others.
When young Sisters are told that there is something wrong with a young man if he isn't serving God at a certain level by a certain stage in his life, it sets up a situation where a young man might find himself striving to achieve spiritual goals for the wrong reason. A young woman could also make the incorrect assumption that just because a young man has reached a certain level in the congregation, he has a "good relationship" with God and is sure to make a good husband.