A Doctor had an elderly patient "drop" in on him for an unscheduled appointment.

"What can I do for you today, Mr. Smith?", the Doctor asked.

The aged gentleman replied: "Doctor, you must help me. Every time I make love to my wife, my eyes get all bleary, my legs go weak and I can hardly catch my breath... Doctor, I'm frightened!"

The Doctor, looking at his 86-year-old patient, said, "Mr. Smith, these sensations tend to happen over time, especially to a man of your advanced years, but tell me, when did you first notice these symptoms?"

The old gentleman thought for a moment and said: "Well... three times last night, and twice again this morning!"