It might be hard to get through to some people, but I really believe what I was implying to be the honest answer for most people. I'm not absolutely sure it would have absolutely helped him (he might have some condition that might explain it better than my guesses), but if you can for a moment entertain desire and suffering. Many people suffer when they desire, no matter what it is that they want. In our culture, it's always about the next goodie, getting this, doing that, so on and so forth. However, if you really desire or imagine something and it turns to not be present to you, it is in that desire and want that creates your sorrows and frustrations.
The problem with desire pertains to culture, and this is where I felt this man got lost in. Culture is all about desire, the need to fit in and belong. As such, social constructions are made and stereotypes are raised that if one does X, they're an adequate member of functioning society. If they do not, they are somehow inferior, a lacking uh oh. The problem we have with sexuality and desire in our culture is often perpetuated in the idea that one must have it, and if you don't you're some sort of fuck up. This is why people build up useless, unnecessary anxiety regarding sexual experiences, especially the first one, and why many who have engaged in sex say it's not even a big deal; they have seen through the overemphasis as largely ephemeral. The problem starts firstly with a societal overemphasis that it's not simply normal to desire sex, but that one must also have it. That must becomes a box for many to check, and like I was eluding to before, the fact it is an unchecked box can make people feel absolutely inferior, to be "lacking" somehow. This man is a perfect reference to this; he has material wealth and more experiences with the world and Hollywood than most people on GAF, yet because he never smanged someone, he was somehow the most emptiest person on the planet. He impoverished what things he may have ever had with the things he wanted.
I did not say that sex is a social construct, but the idea that he must have it, especially at his age, is indeed a social construct. It's a stereotype, an idea. And the truth is not everyone fits into that mold, which only gives credence that it's an idea and not an objective fact. The problem with culture is the images we use to account and reference things are often frequently used as ideas that everyone fits those molds, and if you are an outlier, you are somehow strange or out there. You can see this a lot with racial stereotypes. His perception of sex became a problem because he felt he had to have it, which grew into resentment and outright hatred for others who had it. His suffering became his torment because of his desire.
A solution for him (again, assuming it was all on his extreme desire and not anything else) is a solution you can offer for many; chill out on the desiring. Be content with whatever it is you have in your life as it is, and if you want more, sure, want. But don't let that want be a noose that you will hang yourself by if you lack it, which this man seemingly did. If you continue to project what you desire over whatever it is you have in the present moment, you are in for one hard fucking life, for you will never, ever be satisfied.
If I have been enigmatic, please feel to pry about it. I do sincerely believe most suffering people go through is entirely cognitive and entirely self-made, all rooted in desire for something to be different, or to have something, and there's perhaps a chance that this man killed over it. It sounds very buddhistic, very zen, but I think it is also incredibly realistic to see in others. Why do you get angry in traffic? Because you expect there to be none.
EDIT: I also don't think him actually getting sex, after all he thought and twisted it in his mind would have helped. It sure as shit would not have met his own expectations, and in turn probably escalate his feelings to what would have happened anyway. It takes a lot to then start twisting people, skin tone, and socioeconomic status over an experience.