Who were the people you played with and what did you play?
A woman I had known from the internet and met some times. After some alcohol we decided to play a simple strip card game. Well, I lost. She was still in her jeans and bra 
And I never got to see her naked.
How long did you have to stay naked?
About two hours. Our agreement was that the loser had to stay naked for the rest of the evening. The winner could redress immediately.
Were you the only one naked?
Yes. There weren't any other persons.
Males: did you get an erection (and how often or long) while being naked? What were the reactions?
The first time when stripping naked and later about four or five times, each for several minutes. It was very embarrassing. She had quite fun. In the end she gave me a handjob to finish my ordeal 
Did you have to do anything to get your clothes back?
No. After my orgasm I could redress.