Think less "I'm working 60 hours a week for my ignorant overlord and now I'm keen to do more!" and more "I'm really struggling to find purpose and enjoy the job that I have enjoyed in the past; now I'm feeling more content with general life and I'm positive about getting back on track at work."

What way of thinking?

OP listed some untypical benefits that come with sex - I think we are all aware of the typical benefits. He/she didn't say "these are the reasons you should have sex"

Shoehorning productivity as a benefit to things in life that should have nothing to do with productivity. It reeks of viewing activities in life as means to increase productive output, which is... Sad.

What do you have against productivity?

Where did I say that? Please, read my comment again and interpret it correctly before shoving words in my mouth... Jesus.

(re)productivity