John Piper, Ligon Duncan, Russell Moore, and Greg Gilbert at a panel of the 2012 Together for the Gospel (April 2012):
Tim Keller, Don Carson, and John Piper at the Gospel Coalition council members’ meeting (May 2012):
If you are new to this subject, here are some resources I would recommend starting with:
1. John Piper and Wayne Grudem “50 Crucial Questions About Manhood and Womanhood.” This is a free PDF that gives concise answers to 50 questions. This is the place to start.
2. If you want to hear the audio or read the notes of a weekend seminar, looking at passages and objections and application in more depth, take a look at this free seminar by John Piper.
3. For introductions written by women, consider Carrie Sandom, Different by Design: God’s Blueprint for Men and Women and Claire Smith, God’s Good Design: What the Bible Really Says About Men and Women.