Unwanted First Time Experience

Alright, listen up, you big dummy. This joke is dark, like a cave full of bears with bad attitudes, which is based. The joke sets up a comparison: "first time sex" is like getting a "crappy used car." That's already saying the experience was bad, right? Like, really bad. But then, the punchline hits you like a salmon to the face: "I didn't want it but dad gave it to me anyway." This is where it goes from just a bad experience to something super messed up. The implication is that the person's first sexual experience was non-consensual and, even worse, involved their own father. It's a shocker because it takes an innocent analogy and twists it into a statement about abuse. You, my friend, probably thought this was just about a bad car, didn't you? Your brain is smoother than a river rock, I swear.