Recent studies suggest sildenafil (Viagra) may lower Alzheimer's risk. People who have taken the drug have improved blood flow in the brain and reduced toxic protein buildup that’s common in the disease. But more studies and clinical trials are needed before the medical community can recommend Viagra as a preventative or treatment for Alzheimer’s.

Sounds like a win-win to me.  You get easier, better and more predictable hard-ons and a lower risk of Alzheimer's disease.  So what the drug manufactures make money because of it.  

Does Viagra only help with ED? I don't have that problem but my libido is just horrible. I have no interest in women. The hottest chick around could come up to me and say "Why don't you take me home and fuck me to China", my response would probably be, "No I need to go home and bake some cookies, then do laundry"

It's a nightmare. I can watch porn and get zero stimulation. I go several weeks or more without jacking a load out, this is unhealthy for the prostrate and probably the psyche as well

Then let a doc decide what to do about it. I've never needed a supplement myself but know that taking testosterone can lead to cancer. So be careful.

I think if you are that concerned about it you should seek trained medical advice. Listening to what a bunch of anonymous strangers have to say here will probably go wrong for you.

 
If you've just kept it to your self and not looked into things here are a couple of links you might find of value
https://my.clevelandclinic.org/health/diseases/15216-low-libido-low-sex-drive
https://www.webmd.com/sex-relationships/features/loss-of-libido-in-men

 
It does seem to be the case that different men have different levels of drive so trying to compare your own drives with others (particularly on a board like this) is probably not the best approach, particularly if you see yourself as deficient in someway due to your level of drive. But if it is something you want to see about doing something about seek informed help.  

 
I'd also point out that if you don't have a high drive for sex so don't feel that need to get the release and relief, you can sit back, engage when you do feel horny and the laugh at others that might be out spending their retirement account before they even saved it.

... why a man with that problem spends time writing on a forum dedicated to the satisfaction of urges he does not have.  
.
Something does not add up here.

I agree, if the erection is good, but the libido is failing, it most often has to do with hormone levels , not ability to perform.  Been taking T-therapy for about 12 years, originally to improve my workouts at the gym and build muscle mass, but I found as a side-effect that it also has the effect of increasing the need to have sex more often.  If his response to a hot chick who wants sex is that he would rather bake cookies and do laundry, I would also recommend checking T-levels before just conceding that he might really be gay and didn't know it until now.  

Up-selling and Bait-and-Switch can also have a negative impact.

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