There was once a cartoon in Mad Magazine that went:
[Patient] I'm here to give a sperm sample
[Nurse] Here, take this cup and go into this room
[Patient] Don't you have anything to help me out?
[Nurse] Sure, why not just fantasize about me?
[Patient] In that case, I'd like to exchange this cup for a barf bag
...I guess it was funnier when I was 11.