What way round is worst? Because I don't know....
1) Your mother having two kids, one of them you, one of them your sister, when the father is two different people. And then inserting your penis into the fanny of your sister.
2) Your father having two kids, one of them you, one of them your sister, when the mother is two different people. And then inserting your penis into the fanny of your sister.

I'm not sure what sinario would be more "frowned upon" when you insert your penis into the fanny of your sister.
( G/PP 💩💩💩💩💩&#128, Fri 10 Sep 2010, 14:11, 2 replies, latest was 16 years ago)

I think they are equally frowned upon
but my instincts say that scenario 1 is the worst, don't know why.

fortunately for me I have no sisters, long lost or otherwise, so I won't have to face that particular moral dilemma.
( Vipros. clever got me this far, then tricky got me in, Fri 10 Sep 2010, 14:13, Reply)

So what you're saying is, you wouldn't insert your penis into the fanny of your sister?

( G/PP 💩💩💩💩💩&#128, Fri 10 Sep 2010, 14:14, Reply)

if I were pressed on the subject
I would say that no, you should not insert your penis into the fanny of your sister.
( Vipros. clever got me this far, then tricky got me in, Fri 10 Sep 2010, 14:15, Reply)

Pffft. Weaklings.
You would if there was nowt else. Probably have to be rape though.
(porkylips looks better as the sun goes down., Fri 10 Sep 2010, 14:20, Reply)

"I will have you, even if it must be burglary!"

( Vipros. clever got me this far, then tricky got me in, Fri 10 Sep 2010, 14:29, Reply)

Actually, I seem to remember reading that it isn't wholly uncommon for siblings (not just half siblings)
who have grown up seperately to feel a sexual attraction to each other when they eventually meet.

I think it might have been in Urgh - Weirdo Weekly, that being my reading material of choice.
(Cave Duck, Fri 10 Sep 2010, 14:36, Reply)