Ok Blob, let's modify the scenario for you a bit.
You can either have a hot girl that likes Transformers, or a real life Optimus Prime that follows you around everywhere and destroys anything (or anyone) that gets in your way.
Choose.
Well that's different because Optimus Prime is awesome, and not just a little yellow rat that occasionally says "Pika!". Aside from being dangerously electric, it's just any ordinary household pet. I can buy a hamster anywhere.
But there's nothing close to a giant sentient badass robot that transforms into a sweet set of wheels too.
No wait, the other option is a hot girl that likes Transformers. I don't even leave the house that often, so why do I need a semi trailer anyway? Where am I even going to keep that?! I'd rather sit inside watching the original Transformers movie with the chick.
I'm not gonna lie though. If either one of them said "I want you inside me", I'd be equally aroused.