Low libido

Hi.
I have an extremely low libido and my sex drive is almost non-existent which is strange I know because usually men will do it to anything that moves. I have been diagnosed with schizoaffective disorder about 3 years ago. My psychiatrist at that moment (a well known and respected professor) said that even with his 30+ years of experience he does not know the cause of my low sex drive. I just do not think about sex, I do not fantasize and do not even get an erection when watching porn and I have always been like this. Any advice?

Usually men will do it to anything that moves. Not always. And you are not that sort of a man. As simple as that. Why make it into a problem? Sex is a habit. In your case you do not 'suffer from' that habit. There is nothing wrong with it.
On the other hand, many psychiatric and other medications can lead to low libido. Cut those ones out if you can. Many medical problems can lead to low libido. Get yourself checked physically. Exercize etc.
If all is well and there is nothing that needs correcting - then just leave the low libido alone. Sexual energy saved is not wasted. It can be used for other endeavours. Meditation is one of those. Check out 'Sex Matters' by Osho.

yea sex is a habit and sometimes we get obsessed about it that sometime we forget to respect our partner and we abuse it