There's a chap who spends a bit too much time thinking about what pooves get up to

[Burney]

I think the techniques he described may be undertaken regardless of orientation. The latter in particular does sound physiologically unwise, tbf.

Perhaps, but his bio describes him as an ex-boxer, which I don't think is recommended by doctors, either.

Clearly he feels that fists are OK in some areas, but not others.