Everyone has behaviors that feel unnatural for their personality. There will always be people out there who will do what they're told, even if its morally wrong, if the person asking is throwing a tantrum (yelling, crying, etc). A good person can recognize that about their partner and decide not to exploit that. Amberlynn saw this quality in Becky and saw an opportunity to have a partner she could easily control. Becky could say no in theory, in practice it is unlikely. She really needs to leave amberlynn and get with someone who won't take advantage of her. (none of this means becky is a great person, just that she can't deal with adult tantrums without giving in for whatever reason).