We are fearfully and wonderfully made, which includes our genitals. However, many Christians seem reluctant to meditate on this fascinating part of our creation. As a result, many adults possess only a very basic understanding of their sexual anatomy and functioning.
Take time to marvel at how God has crafted you. Having a thorough understanding of your body allows you to love your spouse with your entire being: body, soul, and spirit.
Paul & Lori Byerly of The Marriage Bed provide a good introduction (or refresher) on sexual anatomy and responses.