But a new study by Dr David Greening of Sydney IVF, an Australian center for infertility and in vitro fertilisation (IVF) treatment, suggests abstinence is not the right approach.

• “悉尼体外受精”研究中心的大卫?格里宁博士开展了此项新研究，结果显示禁欲做法欠妥。该中心是澳大利亚一家研究不孕不育与体外受精疗法的机构。