What is a self defeating or masochistic personality disorder and is it common?

yes. When I was at sea on oine of my ships there was an Assistant Steward, who had to look after officers cabins and make our bunks who did seem a bit that way. He challenged me on a long boring passage across the Pacific when we were both off duty to play him at chess with a bet of 1,000 Japanese Yen that he would beat me. I stupidly accepted and he soon got on top, but then suddenly made two stupid mistakes like allowing me to check him with my knight so that I could take his queen next move. So I ended up beating him.He did exactly the same again a few days later with a very similat fatal mistake. I noticed when he paid me the money he had an erection which he tried to hide.

Yet this guy was a very hard worker, very responsible and able in doing his job and far more intelligent than most merchant navy ratings are. I am fairly sure if he played his best he would thrash me every time and believe his mistakes were secretly deliberate. I also found out he had been single all his life and he had never shared his bed with anybody in his life, but he was always extremely secretive about his own personality. Yet was extremely good at assessing other people's characters and on more than one occasion took the blame for somebody else's failings and so got into trouble with the Chief Steward to protect a shipmate.

It is interesting that what another answerer mentions this has been taken out of the Diagnostics and Statistical Manual of Mental Disorders in the USA, suggesting either the so-called experts do not always understand their subjects or else they do not consider this to be a mental disorder..

Yeah, that is pretty unhealthy and can probably lead to lots of co-occuring conditions for exapmle drug and alcohol abuse, depression and anxiety... That is the weirdest disorder I've ever heard. So basically the person hates it when things go right, and loves it when things go wrong? Well I guess that means that nothing bad can come from it as they'de want the bad stuff anyway! I never knew it was possible to be happy being miserable... Maybe your depressed?

Erectile dysfunction (ED) is the inability to get or keep an erection firm enough to have sexual intercourse. It is also sometimes also referred to as impotence. Treatments for erectile dysfunction https://tr.im/R1i0M

Occasional ED is not uncommon. Many men experience it during times of stress. However, frequent ED can be a sign of health problems that need treatment. It can also be a sign of emotional or relationship difficulties that may need to be addressed by a professional.

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That may or may not be the case. I've never heard of the disorder you mention.

However, what you describe about self-defeating and all, it sounds like he has low self-esteem.

I would say mild version of this disorder are common.

This disorder is one where a person tortures themselves mentally and or physically because they enjoy pain.

No, I do not. I do know that it isn't currently in the DSM though but I think it should be included.

i've also never heard of this ... must be horrible to live with and to be around someone who has this ...