I give people that can pull of casual sex like this a lot of credit. I'm not old fashioned, I'd just be anxious as heck about an intimate moment being one of the only things I'm being judged upon by another person. It's such a hard thing to practice and be truly good at (it's inherently awkward, and porn certainly doesn't count as practice). It's a joke, but comments like this just make it feel almost like a competition. I'd feel like I was taking a big exam or on stage without a rehearsal.