Financial worries and the stress of caring for children leave them too listless for bedroom fireworks, a survey claims.
But they should not despair. The best sex apparently happens in the fifties, while sexual confidence peaks between the ages of 60 and 69.
The Sex Census 2012, which involved almost 25,000 respondents, suggests that 25 per cent of those aged 30 to 39 are unhappy with their sex lives owing to money worries and the demands of modern life. In the same age group 35 per cent said caring for babies and young children was having a negative impact on their sexual relationships as they were just too tired.Low body confidence and depression also played a part in their lack of desire.
The survey was funded by the charity Relate and the Ann Summers shop chain. Paula Hall, sex therapist for Relate, said: 'We know from previous research that the thirties can be a difficult period for some.
Jacqueline Gold, chief executive of Ann Summers, said: 'We are all aware of the impact stress has on our lives, but it is interesting to see the negative effect it has on our sex lives.
'Sex is a hugely important aspect of relationships and communication is a major part of this.'