Sex is very different to the activities he listed. His activities are all about feelings of calm focus, flow, almost meditative joy. You feel pleasantly recharg

Sex is very different to the activities he listed. His activities are all about feelings of calm focus, flow, almost meditative joy. You feel pleasantly recharged at the end of it. Sex is usually very different and all about dopamine-like immediate intense pleasure, excitement, adrenaline. You can build dopamine tolerance and start needing more for the same 'kick'. Afterwards you can end up feeling more low than before due to a dopamine 'valley'. Then there is also the 'Coolidge effect'. I suspect very different neurotransmitters are involved. In other words, to exaggerate: the feeling of being in the zone you get from 'repairing stuff' is as similar to the feeling from sex, as the enjoyment of practicing calligraphy or meditation or tai chi is similar to taking heroin.