In traditional Gikuyu there's something called 'Ngwiko'. This is a practice that's meant to facilitate the cultivation of sexual energy.
When one digs through mythology and traditional philosophy one finds that this act is linked to qi gong in China, and a yogic practice called 'Sambhavi'.
The effects of this practice are powerful enough, in my opinion, not just to forestall cancers for most people, but at least opens up the possibility of a reasonably enjoyable social life.