 Other examples of Leykis 101 guidelines include never dating single mothers or co-workers; never cohabiting with a woman; using birth control during each sexual encounter; and immediately ending a relationship if a woman issues an ultimatum.Leykis constantly recommends that young men pursue their career or educational goals and not be distracted by serious relationships or marriage at a young age as he was.Leykis describes many women as "dream killers" (i.e., he argues that, in dating or marriage, women will typically prioritize their desires above a man's, and will actively discourage men's ambitions for fear of him leaving the relationship if he attains success).