Sometimes dick is just powerful. That one look or that nibble on your ear, kiss on your neck, or whisper in your ear and you're right there and you find out you don't have a condom.
I have a boyfriend and I'm in a slight predicament right now. Power bottoms be thankful you can't get pregnant and if you're smart you would carry a condom and don't always expect your partner to. That's where they get you at.