I had a terminal value that I wanted to reproduce. So I have a small child, we're trying for another, and I have also donated sperm. (In the UK, if you donate viable sperm, it is pretty much certain to be used - there's a terrible shortage. So I'm going to have more kids. Free kids! Raised by someone who actively sought to have kids! They'll get my name when they turn 18, perhaps they'll get in touch ...)

Now that I have one, I can tell you that I'm enjoying this hugely. She takes up a huge amount of my time and attention. But it is utterly fascinating to watch a small intelligence develop, to watch each skill come online. She's also really cool. I like her. I'm glad her mother had two kids already, so I had someone experienced on hand ...

If you don't have a terminal value to reproduce, I'm not sure I'd actively recommend having kids anyway. But it's still pretty good IMO. Frequently exhausting, but good.

If you're smart and male, even if you don't have a terminal value to reproduce, donate sperm. Donate all they'll take.