Many surrogate mothers find that the experience is too physically and emotionally exhausting to even consider repeating. Some do go back for more, though -- but probably none as many times as one Welsh woman. Liz Stringer -- a single mother of two daughters -- has given birth to six surrogate babies, the last in 2010, at age 47. When she was 20, she vowed to try surrogacy when cervical cancer left a close friend infertile. Her first surrogacy experience finally came in 1997, when she carried a son for a couple who had been trying to get pregnant for 20 years. She's had five more since then, with no regrets (and no payment). "The huge emotional rush I feel seeing the parents' joy is what makes it addictive," she says [source: Carroll].
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