This copy is for your personal, non-commercial use only. Distribution and use of this material are governed by our Subscriber Agreement and by copyright law. For non-personal use or to order multiple copies, please contact Dow Jones Reprints at 1-800-843-0008 or visit www.djreprints.com. http://jp.wsj.com/article/SB10001424052702304856504579151090988970388.html
![なぜ私たちはセックスをするのか─夫婦間の素敵な性生活の秘訣](https://cdn-ak-scissors.b.st-hatena.com/image/square/a8636b976fbacb9c58630f2e280b19564befc1f0/height=288;version=1;width=512/https%3A%2F%2Fs.wsj.net%2Fpublic%2Fresources%2Fimages%2FBN-AB659_bonds1_G_20131021130344.jpg)