VINNE AND PUZZLED---
Both of you should know that it is very, very rare for a man to have RE with just one woman and not others. Yes there is such a thing as "situational" RE and as a matter of fact it was an enquiry about this common type of RE that started this thread. But the very first post describes the most common type of situational RE and that refers to being unable (or able) to orgasm with only certain TYPES of women...not one particular woman.
This being said if a man is dating and therefore free to move on should his RE crop up with a certain woman or more likely a "type" of woman, then in almost all cases he moves on. The real problems happen when a married man finds (at any time in the marriage) that he can't ejaculate with his wife. And leaving a marriage because of that alone is a drastic step, especially if children are involved, so he is trapped and many times the marriage becomes sexless.
But in a boyfriend/girlfriend type of situation why would he stay if his RE is being caused by a lack of attraction? It dosn't make sense. It is more likely he is depressed, anxious, suffers low self esteem or is masturbating too much.
In some cases he may have a deep seated fear of intimacy. This can cause him to suffer from a MADONNA/WHORE syndrome where he only gets sexually excited with women he has no interest in other that physical. As soon as he meets someone he actually cares for, the fear sets in and it manifests itself as being unable to ejaculate. This is most likely the cause of the RE in this thread's first post. This type of problem is usually caused by verbal, sexual or physical abuse in childhood (is very common in son's of violent alchoholics) and is also linked to a subconscious fear of rejection or abandonment.
Another common trigger for RE is anger at women in general. The fact that women hold the "key" to a man's sexual pleasure can make some men extremely angry. That they can say yes or no to sex and can force a man to jump through hoops and go through the song and dance of seduction and then expect HIM to perform....well this all gets bottled up inside some men. They may not even really think about it on a conscious level but it is there and it manifests itself in the inability to let go.
Sometimes you can tell if this is causing the problem by finding out what kind of porn turns him on (if he is into porn.) In many cases these men like "the rough stuff" like extreme oral sex (throat gagging) videos, torture or S&M or any video who's main theme is submissive and degraded women. Finding out what he likes, may hold a clue. As you can imagine, good old loving, tender and intimate sex with a woman is just not going to get these guys horny enough to cum.
Many men (especially younger men) suffer in silence with this. They tell their girlfriends or dates that it is no big deal. But all women should know that this is false- it is a VERY big deal. For men sex is orgasm centered.....the main reason for going to all the trouble to actually get a woman to agree to sex. So sex without orgasm is not sex. Women can get along fine without orgasms because they enjoy the intimacy. This is not the case with men. This goes to the very core of their sexual self esteem and what it means to be male.
All I can say is read every single post here and also go to:
http://www.fertilitext.org/ubb/Forum4/HTML/000029.html
and read all the posts there. If nothing you read rings a bell or sounds familiar or similar to what the men in your lives are going through, then by all means get them into therapy. If they are under 30 the chances of a cure are better than if they are over 40.
In Vinne's case it sounds like your BF is suffering from a psychological cause for his RE rather than it being a case of not being attracted to you. Like I said...if THAT were the case, why would he stick around?
Puzzled---your guy may have trained himself to only react to his own touch and the heavy visual stimulation of porn. This too can be fixed with therapy and quitting the porn and masturbation.
Ask them about the numb penis thing...this is important and the best place to start to get a handle on this. If it's a mild case of RE, Viagra can help the penis feel more sensitive.