No they aren't - Twins are formed when an embryo splits, clones are created from cells taken from a mature organism, which are then converted back into stem cells and implanted - totally different process, and it's been shown not to work too well thus far.
Anyway - I can just ignore the scientific solutions on the grounds that they are not part of man's natural condition, will never be universally available like sex, and should be disregarded from the moral question.
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