Newgroup and rmgroup control messages at ftp.isc.org /pub/usenet/control/alt/alt.sex.fetish.cost.benefit.analysis.gz. See also misspelled variants alt.sex.fetish.const.benifit.analysis, alt.sex.fetish.cost.benifit.analysis.
Was it wisely propogated? It may not have been accepted by many peered servers. If I recall not all groups propagated to all other servers (in theory of not in practice?) so if you were not on an isp's nntp server it may have gone nowhere.
Wisely? Seems so. Widely? Probably not (what does on call this kind of typo? Reverse Freudian slip?)
‘alt’ groups typically were filtered heavily.
If I recall correctly it was created at the same time as alt.sex.aluminum.baseball.bat and alt.sex.tonya.harding.spank.spank.spank, but I'm old and could be misremembering.