Beth, you went through the normal transition. When suddenly there’s a cornucopia of sex it’s natural to glut on it; later comes the need for balance. Congrats for not drawing the wrong conclusion (“oh dear, sex must be bad…”) but instead sorting out your schedule. One thing a friend of mine did some years back was to attend every month or two a swingers’ private party on Saturday nights so she could fully indulge (e.g. several men in the same night, and often in creative combinations) so as to “top up” her regular activities which, for reasons much like yours (children, job, keeping a healthy lifestyle) she had to maintain at a lower level than was ideal from a purely sexual perspective.