Alright, listen up, you knucklehead. So, Frankie is being all flirty and stuff, right? Inviting Tyler over, saying they're home alone. Tyler's thinking things are about to get spicy and asks if he should bring a condom. Frankie gets impatient and just says, "let's fuck" implying they want to get right down to business. But then Tyler drops the punchline: "I thought you never asked". Tyler is implying that Frankie wasn't being explicit enough and he wasn't sure if Frankie was interested in having sex. It's funny because Tyler is acting like Frankie was not being clear enough. This is the type of dude that needs to be hit over the head with a frying pan to understand something.