mqo stated - "We figured some stuff out like how she 'wants' to be perfect (including sexually), and she has basically put the pressure on herself. Or so she says. I think she's most of all anxious that she 'isn't good enough at it'. It may also be that she is intimidated about previous partners I had."
This is/was my H to a tee. He is a perfectionist as well as a conflict avoider. Just be careful your W does not ignore the problem. It will not go away on its own.
