div class=trans-pagebuttonPage 1button div class=trans-image a href=https:reader043fdocumentsnetreader043viewer2022020312575068961a28ab0f07b0da51html5page1jpg target=_blank amp-img class=trans-thumb alt=Page 1: The joy of sex src=https:reader043fdocumentsnetreader043viewer2022020312575068961a28ab0f07b0da51html5thumbnails1jpg width=142 height=106 layout=responsive amp-imga divp© 1995 Nature Publishing Groupp div class=annotation div class=annotationTitleanudiv div class=annotationContentsIMAGE UNAVAILABLE FOR COPYRIGHT REASONSdiv divdivdiv class=trans-pagebuttonPage 2button div class=trans-image a href=https:reader043fdocumentsnetreader043viewer2022020312575068961a28ab0f07b0da51html5page2jpg target=_blank amp-img class=trans-thumb alt=Page 2: The joy of sex src=https:reader043fdocumentsnetreader043viewer2022020312575068961a28ab0f07b0da51html5thumbnails2jpg width=142 height=106 layout=responsive amp-imga divp© 1995 Nature Publishing Grouppdiv