Reading through all this it seems to mainly miss the point that the
traditional meaning of "Incest" comes from the legal and religious (for
some religions) restriction against having sex with a blood relative which
can lead to offspring with amplified genetic defects (see royal
dynasties). IIRC you used to have to get approval from the Church before
you could marry a cousin (but no idea if there was a legal equivalent).
Reading the above quote, I am relieved to see that Grannies were always in
with a chance. I assume there may be an equivalent offence of Incest by a
Woman which covers that off, though. Great grand-daughters also.
Hmmm....assuming that you breed as soon as you are of legal age (not
always the case) then child @16, grand-child @33, great grand-child @50,
great-great-grandchild @63. Noting that by point genetic dilution will
have mainly removed the direct risk of enhancing familial genetic
recessives. Likely there is more risk interbreeding with nephews, nieces,
cousins etc.
If I am reading all this correctly, once you are both above the age of
consent and not in a dependent relationship you can shag family members to
your heart's content as long as you don't scare the stock.
Comments about step-daughters illustrate that the offences under
discussion relate to having sex with a vulnerable/under age family member
and so to me don't fall into the area of incest but into a wider category
of sexual offences. Didn't Woody Allen marry his step-daughter?
I assume that since the availability of fairly reliable contraception and
abortion on demand the risks of an unwanted and defective child have
receded enough for the specific genetics based restrictions to be regarded
as outdated.
Wandering even further from the point, since the onset of (reasonably)
reliable DNA sequencing it has been suggested that up to 10% of children
may have been fathered by someone other than the expected father. This
does make me wonder if this could be the basis of a defence under the old
law - that is, DNA sequencing shows that she is not my genetic offspring
so no offence of Incest has taken place - and so the old law from 1956
referenced above has been rendered more or less pointless.
TL:DR - it seems that Incest (as traditionally defined as a genetic
safeguard) is no longer an offence. Offences which protect the under age
and vulnerable take no recognition of genetic relationships.
Cheers
Dave R
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AMD FX-6300 in GA-990X-Gaming SLI-CF running Windows 7 Pro x64