Ok so lets be honest how many of us thought the sex scenes between Bella and Edward were beyond amazing? But lets be real for a minute and consider the facts...first of all Edward is a vampire, also known as the living dead. In order for a male to preform sexual intercouse he has to have vascular circulation to the penial region thus causing what is known as an erection. This allows intercourse to take place as well as for the male to excrete sperm which them moves forth to fertalize a womans ova egg. In order for Edward to preform this act he would have to have blood circulating through his system, not just in his stomach from his last meal. The second point I would like to address is that of Bella consistantly remarking on Edward being like a stone wall as well as lack of body heat (again I address the absense of blood in his cardiovascular system). Regardless of the fact that Edward would not be able to respond physically to sexual intercourse it would feel as though Bella had stones piled on her body, not to mention his arctic body temp. Therefore having sex with Edward would be just like having sex with a popsicle...cold, unsatisfying, and with no end result not excluding becoming pregnant.