Do you feel a relationship is doomed if...
 

If the relationship's beginning was just sex. Every relationship that I had ever been in started out like this -- and they all ended horribly later on down the road. What do you think?

True..once the sex is gone or non existent..you know it's about to end

Hmm, you have an interesting point. In my experiences, the sex got boring no more than a month and a half into the relationship -- the same pussy gets very repetetive IMO. It's funny though, because when you cut it loose you miss it until the next one.