I’ve retired and my sex drive has fallen. I’m letting my wife down | Dear Mariella

Don't equate your self-worth with your business success, says Mariella Frostrup. Rediscover your lust for life and your libido will return

The dilemma My wife and I have had a good marriage, share interests and have wonderful children. I am 18 years older than her and recently retired from a successful career.

We both had a high sexual drive, but for some years have been sleeping apart because I snore. Our sex life never really recovered and - to make matters worse - my desire has gone off a cliff. We have tried, but I usually can't get a sustainable erection - even if I take Viagra.