That's not the comparison I was originally making, though. I was specifically not talking about moment-to-moment sensations of pleasure. What I meant to captur

That's not the comparison I was originally making, though. I was specifically not talking about moment-to-moment sensations of pleasure. What I meant to capture originally is that some people at least somewhat more habitually choose to spend their time in ways that involve sacrifice and delayed gratification, or are OK with activities that are e.g. (time-wise) 90% build-up for 10% release, or however you want to put it. For example, a long climb for a quick descent. Or a long march to see something first-hand. Some people treat those activities as aspirational. And in my experience - which is of course anecdotal - that seems to correlate with whether they can get onboard with the idea of child-rearing. It's something about the effort-pleasure ratio and where your cut-off is, or your idea of how much hardship something special is worth, and perhaps whether you value cultivating an attitude about it.