Mr. Matthews and Miss Hoare: Criminal Psychology in Interviews...Reminds Me Of Lori And Brian LaFond

If you aren't familiar with how a female/male rape and or serial killer relationship is, I would suggest looking at Paul Bernardo and Karla Homolka, but there are other great examples of how this kind of thing happens.  In the case that the victims are the marginalized sectors of society (black; gay; disabled), you tend to see "serials".  People don't understand the dominant and submissive relationship between and husband/wife-killers or a brother/sister.  
Lately, I've been fascinated by the forensic psychology behind the interview process.  Most of you know that I want to get my master's degree in Criminology, so this kind of studying I do almost every single day.
JCS - Criminal Psychology put together this video of a husband and wife-killer that shows that the wife, although playing victim, is actually found to be an antagonist for the other psychological aspects of their sick relationship.  Abducting, raping, and killing isn't limited to the man's mind.  Often times the action part is brought on by the mental part that the female brings to the relationship.  She tends to be dominant while playing on the preferences of the male.
Reminded me of Lori and Brian.
Pay particular attention to the paraphilic disorders that don't allow Lori and Brian to have fulfilling relationships with others.  They both exhibit all of these including cross-dressing, pedophilia, and sexual sadism.  It's an interesting perspective on the LaFond siblings.