People that are allowed to cause problems for others. They cause stress, which affects our immune system in the same way free radicals break down our health.
As a husband, you can not entertain free radical women. They can't wait to see you and your wife fall out so they can try to secure a place in your life.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi