I think it can be a protective measure. If she is afraid of being hurt again she is guarding her heart, and therefore her sexuality as well. I'd say just try and be gentle, and patient. Back rubs can do wonders! Or just holding each other. Sometimes just laying next to each other naked in the bed, then let your bodies do the work on their own. Or not. Maybe just sweet caresses. Long-term relationships have their ebb and flow. Sometimes a spark ignites and takes you totally by surprise!
Formerly married to Sundance
Boyfriend -- Butch Cassidy