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Isn't that a bit implied with "do what you love or important to you regularly"?

It's implied. If it needs explicit mentioning then probably there's something wrong with the culture because there's no reason that normal person wouldn't consider it.

It's common sense between many cultures and philosophies that sex drains energy, at least for males.

Another datapoint of common-sense being bullshit.

How does it draining energy mean it won't help?

And by the way: http://www.cnn.com/2012/08/10/health/sex-athletes/

It's "common sense" in many cultures that the opposite is true.

More importantly, the positive benefits of regular sex have been made evident by virtually every study ever done on the matter.

Stress lowers libido though, so I wonder how one would have energy for sex while feeling burned out.

What kind of pervert, anti-human-nature "culture" and "philosophy" you are talking about? Haven't they victimized and taken the happiness away from enough people already? Not to mention that being a Brazilian I suppose you should appreciate the positive value of sex very well?