A sample of your semen is required for analysis, I'm going to need you to ejaculate into this cup. I'll remain present, just in case you have any questions or require assistance. Don't be shy, go ahead and drop your pants... You'll need to pull down your underwear too. That's it.  In order to ejaculate you're going to need to get nice and hard, so work your penis. Keep stroking it until it's fully erect. You know, I can help facilitate this a little... Just let me pull on some gloves and grab something. There. I've got something I can administer to you via this bag. It's going to make you feel so good. I'll hold the mask to your face and have you take nice deep breaths from it. There you go. Isn't that good? It certainly seems to have quickened your pace. Maybe I'll indulge too... Mmmm yes, that feels so good! Work your cock over for me. Keep going. I'll give you more as I count your down. That's it. I want you to give me a nice big sample.