We had a new female doctor from medical school just qualified, went to have her check me for testicular cancer and prostrate cance. Got a huge hard on but didnt cum, kept apologising for it but she said not to worry, most men get hard with this type of exam. Had to finish myself off in the car park. Judt in case you're wondering, all clear, you should try it with any new young doctor at your practice
True story: I gave sperm samples years ago for a clinical trial. For a month I could only cum during the weekly sperm collection. I was about 20 and used to cumming daily either from jerking or fucking. I would show up so horny. This chubby 30-something nurse measured my balls with a caliper then offered me a selection of porno magazines and a packet of lube. I went behind a curtain and jerked off. It felt amazing to finally get some relief. It was super sexy cumming into a cup for her and presenting her with my load after.