A middle aged couple were taking an overnight train trip and booked what they call "sleeper car".    The sleeper car has three wooden benches,   bottom, middle and upper and people sleep spreading mattress and pillow given by the Railways.     To their surprise, the wife got the bottom bench, husband got the upper and there was a 18 year boy in the middle.     The couple quietly agreed to a code when the boy is asleep and the husband will come down to have sex.

When she was sure the boy was asleep,  wife whispers the code and the husband comes down and they have sex.    It is the middle of the night and the husband falls asleep but the wife is horny and wants to have sex again.   She whispers the code and she embraces the person who came over her and they have sex much longer than normal.     The wife whispers "honey, you are getting better and better".

In the morning on way home the wife tells her husband last night was the first time we had sex two times and you were better the second time.    Husband gets furious and tells his wife "No, I only came down once and fell asleep".    Continues "damn, it must be that kid who came down and fucked you the second time".     Wife says "forget about it honey, that was the best sex I ever had".