My brother-law-once related this story to me after a trip years ago to Argentina. Being Jewish, and also being with my late husband exclusively since college who was also Jewish, I never had an encounter (sexually, professionally, yes) with a hooded serpent! So, here goes ...
He was on an extended trip for work, and in Buenos Aires (great place, BTW!) for about 6 weeks. He met a very nice young lady and went on a few dates. By the fourth date, both their hormones and desires got the better of them and they found themselves in bed. The clothes were flying off and around the room. Things were heating up in the bed, and she starts kissing her way down in a well defined, southerly direction. She moves the sheet and her mouth down in synch, and finally get to "there". Everything seems great. They are getting along quite well, apparently.
Suddenly, she let's out a shriek in Castellano (the spanish spoken in Argentina) AYE DI-S MIO!!!! (OMG!!!!) He bolts into a seated position, literally concerned about what the heck she must have seen, and starts asking, "What's wrong? What is it? What's down there? Are you OK? She looks up at him with a big smile on her face, and just says, "No sabia estas Judio, estas mi primero!" (I didn't know you were Jewish, you're my first!) He tells the story that they laughed it off and he recovered from his fear induced "shrinkage" rapidly and they had a wonderful night!