My boyfriend and I had sex for an hour and thirty minutes. We had to stop because it hurt so bad. I'm extremely tight (as he says) and he's the biggest/thickest I've had. We've had sex a lot but this has only happened three times. After we finished I went pee before we got in the shower and I glanced at the toilet paper and there was a small amount of blood. Is it possible that I was just so sore it caused me to bleed?