[JohnBooty]

We made the choice not to have children, but I do feel that desire to pass on my genes. What's it like?

   sexual desire is like taking a piss

I would say it's less of a basic biological desire like peeing or sneezing, and more like... esoteric/abstract concepts like "the desire to do good" or "the desire to achieve."

I realize it's not really a logical desire, and even though I do feel it, it's far from my highest priority and I've also chosen not to have kids for a variety of other reasons.

[rrgok]

I see, thank you for your point of view. There are times I feel lonely, even though I like to be alone most of the time, and when that happens I wonder if having a child would've changed anything.

It really must be an "abstract" feeling, because I cannot get to that feeling in any way.

[JohnBooty]

i guess, in addition to that, there's also the practical aspect of your children taking care of you when you are older. that can be a significant motivator.

in many (most?) parts of the world that is the norm.

however, that is of course a... highly unreliable way of making sure you are taken care of when you are older!