I saw this, and I just knew our TOBers had to have better answers and GIFs.
As for my first time, I threw him to the floor (I didn't want my Mom to hear the brass bed hitting the wall) and rode him cowgirl. Poor guy didn't know what hit him. I knew even then to get mine first!
http://tagroom.com/uncategorised/reddit-users-were-asked-to-sum-up-their-first-sexual-experience-with-a-gif-the-responses-were-magnificent-sfw/