Is this a frequent thing men with large penis' find? My girlfriend remarked on her stomach being sore immediately after sex and also she commented on it being sore the day afterwards as well. She told me how she had to walk differently and I noticed that she had to ease herself onto her back to get into bed.

Is this something that happens even with average guys, or is it a result of it being bigger than she's used to?

She's told me it's because of my size and how I hit the back, but I'd like to know if you guys have had similar experiences.