Sounds like she resents the sex to me. Katie was like that. Be more into her as a person and worry less about the sex. It's hard if you're anything like me but pressuring her wont help. Look into the book "the love dare". It really helps.
"Regret for the things we did can be tempered by time; it is the regret for the things we did not do that is inconsolable." - Sydney Smith
Kyle: 27 year old male
Katie (rymmare): 25 year old female
Kids: girl: 5 years old, boy: 3 years old