I pestered him for a couple of months. Finally he agreed to go with me. But when there he would not take off his bikini swimsuit even though I was parading around naked with several people watching nearby. Second time we were at a less crowded place and after I had stripped, he finally went all the way. I was proud of him for overcoming his inhibitions. Later, he admitted that it felt good and he has gone fully naked on several more occasions.