Among the most important attributes, if not the most important. There has to be some physical attraction and usually that is what gets things going but it’s sometimes surprising how other attributes become more important as the relationship develops. Charisma and humour is huge. Creativity and skill is a massive turn on. Kindness and self awareness, vital. These are often dependent on or related to the base level of intelligence.

It changes over time, too. As a young man, I devoted very little consideration to intelligence but those weren’t really relationships, mostly sex cosplaying as a relationship.