Whenever it seems necessary and appropriate. Jewish history
has afforded its adherents a ton of golden opportunities
Yes, but Orthodox Judaism does not.
Judaism doesn't allow it (Deuteronomy ch.5).
Not for Orthodox Jews, but the other branches of Judaism allow it.
Orthodox Judaism doesn't allow it.
I was told no, unless you have a twin.
Yes, but not all Reform rabbis perform them.
That depends on the branch of Judaism. Orthodox Jews keep men and women separated to avoid "inappropriate" relations.
Absolutely! Sometimes, Jews make mistakes like everyone else.
According to Wikipedia, Judaism does not allow shaving with sharp instruments against skin, but allows trimming with scissors and possibly dry-shaving machines, as they work on same principle as scissors rather than cutting hair against skin.
Jewish law does not allow eating pork, but not all Jews follow this law.
Orthodox Jews don't allow it, but the other branches do whatever they want!
Yes, but Orthodox Jews don't allow women to sing in front of men.