I knew a girl in school.Straight A student,parents had money,owned lot of land.She had no friends because of her lies.I spent time with her because she was lonely and really was a nice person.We would talk and she would constantly lie.I knew why she had no friends.They were stupid lies, just for the sake of telling one.Later I met her Father. Then I knew exactly where she got it. He lied the very same way.Most people lie for a reason, like to keep from hurting someone or to keep themselves out of trouble, but they just lied for no reason.It changed nothing and served no purpose. I figured her dad just liked to do it and she copied him.
Definitely a mood disorder, Border Personality Disorder being one of them.
http://www.nimh.nih.gov/health/publications/borderline-personality-disorder-fact-sheet/index.shtml
I suppose there can be many reasons for lying. Bear13 has mentioned a couple of possibilities. I'd like to add one more: ADHD. Some, not all, people with attention deficit can be habitual liars. Quite apart from medical conditions, though, lying can also be a strictly psychological problem. Either way, professional help may be required.
All the best!
Hi Jai - Is your husband bipolar or suffer from depression? Perhaps that's the reason, and he should be treated accordingly. Additionally there is a sexuality and relationship forum that is monitored by an expert, so you might want to check that out too and post your question there, there might be a bit more insight... otherwise, if he is depressed, bipolar, etc., then he should definitely see a doctor.....good luck!