Levitical Laws and their current applicability

Okay, this is my second attempt at this post…

Just wondering if anyone has looked into which of the Levitical Laws are still applicable to Christians.  I have just come from a(n older) debate over homosexuality and Christianity, and one of the points raised was with regard to other forms of "sexual expression", like during a woman’s period, or similar.  Are any/all of those laws still applicable? And how does this pertain to us as the "emergent Church"?  How does it affect our practice of Christianity?

Ta!