There is currently no vaccine that is zero risk

and in the same breathe, the risk is closer to zero than not.

Sure but specifics count. 49% is also closer to zero than it is to a 100%.

Complications from vaccines are not anywhere close to 49% if that is what you are insinuating.

Life is generally not zero risk :)

I believe you are right. Including amorous congress and vaccines

What's the risk of a vaccine? What could happen?

Any infection risks sensitizing the immune system against some aspect of the human body. More likely with more severe infections, but not even a pseudo-infection is completely immune from it as it's a property of the immune system, not of the vaccine. The risk is very low, not zero.

(And dengue fever has the nasty property of making subsequent infections worse--and the vaccine does the same thing. Thus you get the really weird risk balance of only vaccinating those who have already had it. Also, Covid is prone to causing myocarditis--and the vaccine carries a small risk of doing the same thing. AFIAK no vaccine caused case is serious, though.)

No vaccine is without risk, but the vaccine approach is based on that risk being so low (but not zero) in comparison to the risk of not vaccinating that it is vastly the better choice.

Ok that was a bad question, let me rephrase: isn't there something particularly bad about this one for males that are already adults that makes it not recommended by doctors by default?

There's nothing particularly bad for adult males.

The benefits may be statistically lower, since you may have been infected by some of the variants already, older males may have fewer sexual partners in the future, and cancer takes a while to develop.

In the USA, it is recommended by default for adults up to 26 and kinda for 27-45.