Is there a border dividing life from non-life?

i've always believed that life could be defined by the ability to self-replicate/reproduce. which brings to mind computer virii which self-replicate as a meaning for existence just like normal virii. which also makes me think that since our bodies are so geared towards reproduction (the whole getting pleasure out of a naturally occuring part of our body), maybe the point of life is to reproduce; the pleasure part only appling to a few species of course. it appears that almost all animal(and i guess lower lifeforms as well) behavior is geared towards the reproductive process. any opinions?