My girlfriend invited me to her house to watch Netflix.

She says “Stay here, I have to do laundry really quickly.”

Out of nowhere, her sexy sister comes in and sits by me.

She asks “Do you want to have sex before she gets back?”

I got up and went straight to my car.

My girlfriend was outside the door and hugged me, and said “I knew I could trust you.”

Moral of the story: always leave your condoms in the car.