Women's vaginally canals can stretch and change shape (like how she forms to her ma. In a long-term relationship). Some women like to be stretched with girth or depth, but the cervix is a fairly hard muscle, and only opens during labor (hence the extreme labor pains) and when I'm fisting my wife, I can feel the cervix but can actually move past it and get deeper, because her vag canal has changed, especially when she gets really excited and everything relaxes. Also, those dildos are pretty soft and squishable. I guarantee she is not repeatedly penetrating her cervix.