Viejo, pero no sonso

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An elderly couple visit a doctor's office and tell the doctor that they are having difficulty having sex. They ask him if he can observe and tell them what they may be doing wrong. The doctor agrees. After the first time, they are somewhat dissatisfied with his response and ask if they can return. He agrees and they again have sex in his presence. This continues about 6 or 7 times.

Finally, the doctor says, : "You aren't having any problems. Why are you repeatedly visiting me and asking me to watch you?"

The man replies, "Well, she's married, so we can't go to her house. I'm married so we can't go to mine. A motel is too expensive and if we do it here, Medicare covers the fee!"