You resist

It takes herculean willpower but you keep your hands by your sides as your cock twitches and throbs. You can feel precum trickle out of your cock and down the sides. Your eyes are squeezed shut and your breath is coming in ragged gasps as you try to resist the growing feeling in your loins. Suddenly Dr Linderman adjusts her grip and begins to rub her fingers inside you. The feeling in your cock intensifies and you can feel it rising up, slowly but inexorably. Your cock twitches uncontrollably, slick with precum. Just as you are about to cum Dr Linderman removes her fingers and turns away.

"Your examination has concluded. If you would like to get dressed I'll talk with you about a few possibilities relating to your condition."

You are lying on the examination table, covered in sweat. Your cock continues to twitch and you feel like any stimulation at all will make it erupt. However, you're not about to start jerking yourself off in the doctors clinic.