[ColdSteelTalon]

Interestingly, I've had fairly strict religious Jews tell me that non-/pre-marital sex is NOT considered a sin under many circumstances according to their religion...

Then they arent reading the Bible for that point of view.

[tortoise]

Then they arent reading the Bible for that point of view.

So YOU say, but that opinion isn't worth much. It is apparently their interpretation of the Old Testament and similar. They could very well claim greater authority than Christians in that respect. If you want assert some dubious "Christian authority" on the matter, stick to the New Testament.