Dear Mrs Salisbury: How do I increase her sex drive?

Psychologist Robyn Salisbury helps a reader with a relationship dilemma.

QUESTION: My partner has a low libido, although she had a high sex drive with previous partners. For the past year or so she hasn’t really been wanting sex at all but we still have it once every two or three weeks. 

As she wasn’t really interested the quality has been low and both of us have been unsatisfied.

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Now she has stipulated she will initiate; that way I know when she wants sex. I was happy we were going to be having more sex, however this is not eventuating.