My woman told me it was kinda painful with our dog inside her.... not knotted either I dunno how big he is down there as he only wants to do her outside. So I'm limited to IR cameras pretty much. Talking about what seemed like the bone hurting to deep.... She does have an IUD and if I'm roaring to go at times she will also say it's painful when I go to deep. Not sure if this maybe a not turned on enough thing at different times with the 28 cycle she is more like yea let's go.... or maybe this is common? Or the IUD? I want her to have fun as I watch but we are just starting and I can't help them cuz he won't do anything if I am around.