Unlike poly women, who can achieve that by simply breathing, this is a somewhat impressive feat. Probably stumbled into it rather than finessed, but still impressive. Power to the guy, its unlikely to last for long but its certainly a good slice of life to eat out of for a time.

Its probably not a great thing to promote for society, as trying and especially succeeding at it will drag us down even further, but coalburners aren't worth preserving anyway.