I don't think exhausting sex is the issue. But the feeling for no more being competitive for sex reduces the drive to work. And I guess raising children also took away time. Considering the case of Pablo Picasso. He still did great work but he never settled down in any relationship and always looking for a new girl like he was young.

I guess to refute the theory, we need to monitor testosterone levels of creative males for all his life. And after their death and 50 years later to judge the correlation of their testosterone level with achievements.

So shall we wait to see Serge Brin and Larry Page's declined capabilities in running Google? :-)

I feel great for coding after sex, if it's with a partner that I haven't just started with. It's like a cloud has been lifted from my mind. A world of distractions are suddenly gone.

I don't think 2 is right. Not enough sleep, that is often correlated, is the problem.

We had sex yesterday, and today, before breakfast, I swam 1.5 miles (crawl) in a good time.

You may reply, the sex was boring...